bing tracking image
  1. Towing Mirrors
  2. K Source
  3. Clip-On Mirror
  4. Universal Fit
  5. Single Mirror
  6. Fits Driver Side
  7. Fits Passenger Side
K-Source Universal Towing Mirror - Clip On - Convex Mirror - Qty 1

K-Source Universal Towing Mirror - Clip On - Convex Mirror - Qty 1

Item # KS3891
Our Price: $34.93
You Save: 50%
Towing Mirrors

Will this fit?

To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

Orders above $50 qualify for Free Shipping
Shipping Weight: 1.63 lbs
In Stock
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
Extra-large, universal towing mirror clips over one of your existing side mirrors to give you an extended rear view. A ratcheting strap system creates a snug fit to reduce vibration. Works on driver- or passenger-side mirror. Tool-free installation. Lowest Prices for the best towing mirrors from K Source. K-Source Universal Towing Mirror - Clip On - Convex Mirror - Qty 1 part number KS3891 can be ordered online at or call 1-800-496-5010 for expert service.
  • All Info
  • Reviews (648)
  • Q & A (0)
  • Photos
  • Why etrailer?

K Source Towing Mirrors - KS3891

  • Clip-On Mirror
  • K Source
  • Universal Fit
  • Single Mirror
  • Fits Driver Side
  • Fits Passenger Side
  • Non-Heated
  • Manual

Extra-large, universal towing mirror clips over one of your existing side mirrors to give you an extended rear view. A ratcheting strap system creates a snug fit to reduce vibration. Works on driver- or passenger-side mirror. Tool-free installation.


  • Extra-large towing mirror mounts on either of your factory side mirrors to extend your line of sight
    • Gives you an expanded view of the road and your trailer
    • Allows you to safely and easily change lanes, back up, pass, and park
  • Adjustable so it fits mirrors of different shapes and sizes
    • Ratcheting system securely tightens heavy-duty rubber straps over a variety of mirrors
    • Mounting arms rotate outward to accomodate different factory mirrors
      • Pivoting joints in the middle of the arms allow further adjustability
    • Sliding clips grab onto the edge of your factory mirror housing and adjust to fit varying mirror thicknesses
  • Snug fit reduces mirror vibration
  • Manually adjustable mirror face allows you to customize your view
  • Quick-release button on ratchet for easy strap adjustment and fast removal
  • Rubber pads on the straps protect your vehicle's mirror housing from scratches
  • Convex mirror makes reflections appear smaller than with a flat mirror, allowing you to see more
  • Black plastic housing provides a clean look and won't rust or corrode
  • Easy, tool-free installation and removal - no hardware required


  • Application: fits most mirrors 4-1/2" to 11-1/2" tall
  • Overall dimensions: adjusts from 4-1/2" to 14" tall x 14-1/2" wide
  • Mirror face dimensions: 7-3/4" tall x 5-1/8" wide
  • Quantity: 1 mirror
  • 90-Day warranty

Ksource Universal Towing Mirror Back ViewKsource Universal Towing Mirror Front View

This adjustable, universal-fit towing mirror expands your field of vision so you can better see your trailer or anything else that is behind you. The ratcheting strap system gives you a snug fit that reduces mirror vibration. Because the mirror arms adjust into several shapes, it can be attached to either the driver's-side or passenger's-side mirror on a variety of vehicles. Each of the mirror's mounting arms is jointed behind the mirror so the arms pivot inward or outward, and 2 additional joints in the middle of each arm add further adjustability so you get the perfect fit.

Ksource Sliding Clips on Universal Towing Mirror

Built-in clips on the arms will grab the lip between the glass on your factory mirror and the factory housing. These clips are also adjustable to fit the thickness of your mirror housing.

Ksource Universal Towing Mirror Ratchet Diagram

The ratcheting system uses heavy-duty rubber straps to tighten the towing mirror securely over your existing mirror. A quick-release button in the middle of the ratchet lever allows you to unlock the ratchet mechanism for fast strap adjustment or easy removal of the mirror. When you install the towing mirror, use the ratchet lever to tighten the straps. When you have the straps securely on your mirror, close the ratchet covers over the ratchets to lock them in place.

A ball joint behind the mirror allows you to manually adjust the mirror face to different viewing angles. You can also turn the entire mirror face to a horizontal or vertical position - whatever works best for your application. Rubber pads on the straps protect the back of your factory mirror to prevent scratches when this mirror is installed for towing. Tools and other hardware aren't needed for installation, and the tight fit means there is no danger of losing these mirrors on the side of the road. You'll be ready to travel in minutes, and the increased field of vision will allow you to cruise the highways stress free.

3891 K-Source Extra Large Universal Clip-On Towing Mirror - Qty 1

Customer Satisfaction Score:

Customer Reviews

K-Source Universal Towing Mirror - Clip On - Convex Mirror - Qty 1 - KS3891

Average Customer Rating:  4.5 out of 5 stars   (648 Customer Reviews)

Extra-large, universal towing mirror clips over one of your existing side mirrors to give you an extended rear view. A ratcheting strap system creates a snug fit to reduce vibration. Works on driver- or passenger-side mirror. Tool-free installation.


I had my doubts about these mirrors when I purchased them, however after about a year and over 10,000 miles, they have work just great!!! They are exactly what I was looking for, they stay put and do not wiggle around. I would recommend these mirrors for anyone looking to purchase strap on trailer mirrors.

So far, so good. The only complaint I might mention is the the straps should be permanently attached to the mirrors. They have a tendency to come off while you are putting the mirrors on. Other than that, they work well!!!
Kpapa - 06/16/2021


Honestly I wanted the FLAT mirror. I received the convex and kept it
as I don't like fooling around with returns. I really need the FLAT MIRROR.

According to your order notes, you ordered the convex towing mirrors and thus, that is what you received. If you instead want the flat towing mirrors, you can find that here: K-Source Universal Towing Mirrors - Clip On - Flat Mirror - Qty 2 # KS69ZR
K-Source Universal Towing Mirrors - Clip On - Flat Mirror - Qty 2
-- Etrailer Expert Andrew N - 10/12/2022


Easy to install and adjust, then it stays where you adjusted it. I even went by a big truck going the other way a little close and it folded my whole mirror in. When I pushed it back, the clip on mirror was still in the same position.


The extended mirrors were easy to install and adjust, no vibration or rattle will driving. Installed and used them for a 1500 mile trip, towing a 22 ft Travel Trailer. They were very useful in making a safe journey. There is no adjustment for their extension which would have help greatly in seeing more of the back of travel trailer, they would work extremely well with flat bed or boat trailer.

Only Exception is I need longer mirrors looking to buy longer mirrors soon The mirrors worked great, never removed them from factory mirrors. Held in places no issues. Do need longer extensions for my towing application. Would prefer mirrors with longer extension. Im towing with 2008 gmc Acadia
Louis L - 04/09/2019


These mirrors are good, but not great. I bought these because nothing else fits my 2004 Ford Expedition. They allow me to see around my trailer much better than the factory mirrors, but the have a slight vibration driving down the road. They also make a very noticeable noise from the wind going between the factory mirror and this product. Finally, one of the straps came off when I tightened it a bit too much, but didn't break. The picture below was done in humor (I took my trailer through a drive through, thought it was really funny, and had to take a picture. The picture is a good shot of the mirrors.)

Honestly, I am not a fan. One fell off going down the highway and busted into a billion pieces.
Jeremy J - 08/24/2018


I had a pair of strap on exterior mirrors for my 2007 Ford Ranger that I was unhappy with for a variety of reasons. The problem with my model truck is there are relatively few aftermarket accessories for it. But when I got the email talking about these clamp on exterior mirrors, I decided to give them a try. I have a winner!

They went on easily and they don't vibrate. Best of all, the adjustment for the passenger side mirror only took two tries to get it just right. Of course, the driver's side mirror is right where you are sitting, so it adjusts easily with one attempt. I'm very pleased with how these turned out. I'll be using them to see around my boat when I drag it down the road.

I havwe not changewd my opinion. Im still happy with the mirrors.
Jay o - 10/22/2016


the ratchet makes them superior to cheaper mirrors

These mirrors have worked out very well I like them.
Ed - 10/02/2022


it worked perfectñy on my Toyota Tacoma 2017


Concern that this model mirror would not fit my 2016 Toyota Highlander Platinum was unfounded. They were extremely easy to attach and fit the SUV mirrors very well. At 60mph, no sense of loosening or significant vibration. I was especially pleased that they did not interfere with the SUV's side warning indicator sensors. Highly recommend.

Thanks for the follow-up. Yes, still using and appreciating the towing mirrors. Theyre easy to install, provide good visibility and provide a stable image when on the road. What more can you ask for?
Jim M - 12/11/2017


Very Disappointing. I've always had good products and service from etrailer since 2012 when we got our trailer, but this product is defective. Got first mirror installed which takes a while; then discovered the mirror is glued solid to its mount, with no adjustment possible. The instructions show adjusting the mirror up/down and in/out, but couldn't be done by two reasonably strong men. I would not recommend this product.

I will have our customer service team reach out to you. These mirrors are adjustable uo and down. To turn the mirror longwise horizontally you would need to unscrew the mirror, turn it, and reattach. You see this at the 1:45 mark on the video link below.
-- Etrailer Expert Jenny N - 12/27/2021


Don't often write reviews but these towing mirrors deserve our feedback. Tow vehicle is a 2005 Honda Pilot with a weight distribution hitch and anti sway bar pulling a 2007 Hi Low travel trailer at 3400 lbs dry. Extension mirrors were needed. These K Source mirrors get our positive review for good reason. Well made and very secure (always re-tighten after several minutes on the road as a precaution). Quality construction, solid materials, all parts fit perfectly. The tightening ratchet was a surprise with its precision. And the release button, well shrouded for safety, works quickly and easily. Good price and fast delivery were a bonus. Etrailer...great job. Keep the quality products coming. 8/28/13.


The mirror works great; however, the side mirrors on my 2012 Jeep Grand Cherokee are tapered so I have to ratchet the straps really tightly to keep it from slowly slipping off. But if I put too much tension on the straps the bottom angle clamps sometimes pulled back (and off) from the face of the mirror frame. I don't think it would fall off, but it happened once and I was really anxious to get to the next exit to fix it. So the next trip I added a short bungee cord to the mix, tying a single knot to get the tension I wanted. This applies enough vertical tension to keep the angle clamps "biting down" on the the face of the mirror. With that small modification it is flawless now.


I've compared these KS3891 clip-ons with at least one of the snap-on variety (KS81600), and found this clip-on product with larger mirrors, that can adjust tall or wide, offers a significantly broader view on both sides of the vehicle, which is the most important peforrmance aspect for me.

However, there are installation and fit issues with my 1999 Ford Expedition Eddie Bauer Series with contoured mirrors.

- The passenger side mirror housing of the Ford has a slightly different shape than the driver side, causing the lower left KS3891 clamp to not fit snug to my passenger side mirror. See photos attached. While the driver side KS3891 fits tightly and parallel to my truck mirror, without movement, the left side is prone to a bit more slippage and doesn't feel as secure. The round contour of my mirrors may pose further problems given the front clamp is not fully engaged on the passenger side. I'm confident the driver side is secure, but the passenger side... will it stay on? Time will tell.

- The KS3891 front clamps are thick, and make contact with the Ford mirror glass, impeding my ability to fully adjust my Ford mirrors in certain directions.

- As others have noted, the upper ratchet straps are plastic (only the lower straps are rubber). Since I have to really ratchet these tightly on my rounded mirrors, seems clear to me that these will wear out sooner than later.

- The upper straps make contact with the upper Ford mirror housing - see photo - and would certainly start leaving their mark if not protected. I added felt tabs to address this - a simple fix.

- These never go on in exactly the same position, and are more clunky than the stylish snap-on KS81600, but ultimately, the KS3891s seem to provide the best, broadest view on both sides of the vehicle, so I'm going to stick with them, and hope they stay on securely and without vibration, especially on the passenger side.


These mirror are the best i have tested so far. I used them on my 08 Equinox to have a better view when pulling my popup camper.

The installation is made within 5 minutes and you get a very good sight of your towing vehicule and around. They dont suffer from any kind of vibration even in high winds and they hold very well.
The only cons that i have is that with my vehicule the added mirrors interfered slightly with the factory mirror so i cannot move them as freely as normaly but its no a big deal.

For the price you cannot find any better mirror on the market.


After 1 year and 4 trips of 5+ hours driving, I have absolutely no issues with these mirrors. They stay secure at highway speeds, even through heavy downpours. Just a tiny vibration but still a clear view down my 8 ft wide trailer and adjacent lanes. I like that the mirrors rotate. I have found the vertical orientation for drivers side and horizontal for passenger gives me the best views on my Chevy Colorado. Recommended to my neighbor for his vehicle.


Fits nice on my 2015 Prius. Easy to attach. No vibration at 60 mph. I can see around my trailer very well.


This mirror works great, very sturdy due to the ratcheting system on it. The mirror gave me the exact view I was looking for when pulling my camper.


Great product, for our 2015 M.B. ML Bluetec 250. The adjustable latches are easy to adjust and the rubber mounts hold them securely in place at highway speeds. Easy on and easy off.
One came loose when I didn't tighten the latches enough and survived a fall at 35 MPH with only minor scratches.
Gives good visibility around our 1966 Airstream trailer for passing and changing lanes.


I installed K-Source mirror onto my Toyota FJ Cruiser factory mirrors and I am very pleased with the fit. I suggest that you place the locking straps in a diagonal pattern for the best results. The factory mirror has a fog light on it that you will have to work with. That’s why the diagonal pattern for straps are suggested.


I have used the K-Source Towing Mirrors on my 2015 Toyota Tacoma with great success for 3900 miles towing out little Scamp travel trailer.


Super easy to install. Adjustable fittings work perfectly on my 2007 Expedition.

Very good fit for our 2014 Chevy Traverse.
-- comment by: Rodney - 04/20/2014


I love this mirror. Easy on and off and it stores nicely under the seat when not in use. I plan to get a second one for passenger side.


This was quick and super easy to install. This gives me a line of sight I struggled with before. I highly recommend this to anyone who pulls a trailer and need temporary mirrors for pulling. This isn't meant to keep on for it is recommended that when not towing, to remove. I just wish these sold as a pair. Other than that, I couldn't be happier.


These work very well! Highly recommend for camper trailers. They don’t sag at all after driving all day, and opening and closing doors. I found it took me about five outings to become an expert - now can install both mirrors and adjust for view in 10 minutes.


2012 Toyota Tacoma Crew Cab- These mirrors are PERFECT for seeing down both sides of our MicroLite 21FBRS. I little trial and error during the initial fitting. After that, No Movement and these mirrors perform FLAWLESSLY! Highly Recommended!!

Show More Reviews

See what our Experts say about this K Source Towing Mirrors

< Previous
123. . .41

Do you have a question about this Towing Mirror?

  • Why

    At we guarantee:
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate towing mirror information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Joe V
Test Fit:
Joe V
Employee Cole B
Test Fit:
Cole B
Employee Shane T
Test Fit:
Shane T
Employee Randy B
Test Fit:
Randy B
Employee Hayden R
Test Fit:
Hayden R
Employee Savanna B
Test Fit:
Savanna B
Employee Andrew S
Test Fit:
Andrew S
Employee Brent H
Test Fit:
Brent H
Employee Shane H
Test Fit:
Shane H
Employee David F
Test Fit:
David F
Employee Ryan G
Test Fit:
Ryan G
Employee Adam E
Test Fit:
Adam E
Employee Jackie C
Expert Research:
Jackie C
Employee Mike L
Expert Research:
Mike L
Employee Robert G
Expert Research:
Robert G
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee John H
Expert Research:
John H
Employee Brandon M
Expert Research:
Brandon M
Employee Adam R
Expert Research:
Adam R
Employee Rachael H
Expert Research:
Rachael H
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Sarah H
Expert Research:
Sarah H
Employee Victoria B
Expert Research:
Victoria B
Employee Zack K
Video Edited:
Zack K
Employee Joshua S
Video Edited:
Joshua S
Employee Jacob T
Video Edited:
Jacob T
Employee Andrew L
Video Edited:
Andrew L
Employee Kathleen M
Video Edited:
Kathleen M
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
Video Edited:
Chris R
Employee Zach D
Video Edited:
Zach D
Employee Andrew K
Video by:
Andrew K
Employee Patrick B
Video by:
Patrick B
Employee Alan C
Video by:
Alan C
Employee Jonathan Y
Video by:
Jonathan Y
Employee Robert C
Video by:
Robert C
Employee Aidan B
Video by:
Aidan B
Employee John S
Video by:
John S
Employee Tricia G
Updated by:
Tricia G
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Alex H
Updated by:
Alex H

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.