bing tracking image
  1. Accessories and Parts
  2. Yakima
  3. Roof Rack
  4. Adapters
  5. Crossbars
Replacement Adapter and Seat for Yakima CoreBar Crossbars - Qty 1

Replacement Adapter and Seat for Yakima CoreBar Crossbars - Qty 1

Our Price: $9.63
You Save: 46%
Accessories and Parts

Will this fit?

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

Shipping Weight: 0.11 lbs
Add to cart
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

Customer Photos


Need help with installation?
Locate installers near me
Replaces 1 adapter and 1 seat for your Yakima CoreBar aero crossbars. Lets you mount crossbar to Yakima BaseLine, RidgeLine, SkyLine, or TimberLine towers. 1-800-940-8924 to order Yakima accessories and parts part number 8880639 or order online at Free expert support on all Yakima products. Great prices and Fastest Shipping for Replacement Adapter and Seat for Yakima CoreBar Crossbars - Qty 1. Accessories and Parts reviews from real customers.
  • All Info
  • Reviews (47)
  • Q & A (0)
  • Videos (1)
  • Photos

Yakima Accessories and Parts

  • Roof Rack
  • Adapters
  • Crossbars
  • Yakima

Replaces 1 adapter and 1 seat for your Yakima CoreBar aero crossbars. Lets you mount crossbar to Yakima BaseLine, RidgeLine, SkyLine, or TimberLine towers.


  • Replaces 1 adapter and 1 seat for your Yakima CoreBar aero crossbars
    • Works with Y00421, Y00422, Y00423, and Y00424
  • Lets you mount crossbar to Yakima BaseLine, RidgeLine, SkyLine, or TimberLine towers
  • Includes 1 adapter and 1 seat

8880639 Replacement Adapter and Seat for Yakima CoreBar Aero Crossbars - Qty 1

Item # 8880639

Video of Replacement Adapter and Seat for Yakima CoreBar Crossbars - Qty 1

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Review of Yakima Replacement Adapter And Seat - 8880639

Hi everybody. Andy here with Let's take a brief look at this Yakima replacement adapter and seat. This is going to replace one adapter and seat for your Yakima corebar aero crossbars. And this is going to work with the following model numbers of that aero crossbar that you see there on your screen. And as you probably know, this is going to let you mount your crossbar to the Yakima Baseline, Ridgeline, Skyline, or Timberline towers, as you see there on your screen.

And this includes what you see here on the table before me. You're going to receive one adapter and one seat. And this is exactly like what you are needing to replace. This is the direct replacement from Yakima. So what that means for you, is you can trust that this is going to work right in place of the original.

You're not gonna have to worry about fitment issues, compatibility issues, or anything like that. So if you are needing to replace one adapter and one seat, for your Yakima corebar, corebar rather, aero crossbars, this is going to be exactly what you need. Well, that's going to conclude our real quick look today. I do hope that it was helpful for you. Again, my name is Andy.

Thank you for joining me.

Customer Satisfaction Score:

Customer Reviews

Replacement Adapter and Seat for Yakima CoreBar Crossbars - Qty 1 - 8880639

Average Customer Rating:  5.0 out of 5 stars   (47 Customer Reviews)

Replaces 1 adapter and 1 seat for your Yakima CoreBar aero crossbars. Lets you mount crossbar to Yakima BaseLine, RidgeLine, SkyLine, or TimberLine towers.


This is the first time that I’ve done business with this company, but it won’t be my last. Their communication with me after the order and through delivery, as well as the fast delivery are second to none. I initially ordered just one set of Yakima BaseLine towers and one Corebar. When I decided that we HAD to take the bicycles along also, I needed the other pair of towers and bar. I ordered from because they were the only company that I could find, with an exhaustive search, that sold the ‘replacement towers’ by themselves. Well, I should have done a bit more research, as the plain towers did not come with the seat or adapter for the bar. Problem solved quickly, and in time to load up and take my Cub Scouts out on a long camping weekend.

Here is the truck before adding all the rest of the camping gear and Tonneau cover. All Yakima: BaseLine towers and CoreBars, Big Catch kayak saddles, LongArm and extension, and Front Loaders for the bikes.


This worked perfectly.


Great fit. Good price.



Still working great. No issues.

Etrailer Expert

Mike L.


@Nicholas We're happy to hear that, thanks!


I replaced the crossbars on my trucks roof rack, changing from round to Corebars. These adapters made it easy. They fit into my existing Baseline towers. Total bar swap was done in less than an hour.

As always, etrailer delivered what I needed when I needed it. Great service!


Yakima never responded, etrailer, same hour....


I needed one new bracket for my Yakima Skyline towers to attach to the cross bars. When I searched for them, this was the site was the first to come up and was the cheapest. I couldn’t find them on the Yakima website without buying a whole new cross bar. The checkout was fast and simple. I received the order in about a week.



Product is working great!


Really easy to assemble it!! Thanks


Replacement adapter worked perfectly


I want to thank the staff at eTrailer for their outstanding support. After my roof rack order got off to a shaky start the customer service staff stepped in and made it right; 100% RIGHT. I cannot thank them, and eTrailer, enough. Regarding the roof rack itself, I have now installed it and can vouch that the installation was a breeze. All parts fit and the instructions were correct. For the record, this is not my first purchase from eTrailer (I've bought hitch items from them before) and it won't be my last. They have ALWAYS given great service, their web site works, their products and descriptions are good, etc., etc. Thank you!


Great invintory. Fast, easy. Kept me updated on the delivery. Thanks Etrailer!


It took some time to get them in as they were backordered, like many other products right now. Etrailer staff were great about keeping me updated due to the backordered, and followed up after the delivery. The parts were as expected and were setup an hour after the mailman dropped them off!


One year later my rack parts are working great! Study and dependable!


Had the amount of pieces and exact equipment detailed in the store posting. Exactly what I was looking for!


Exact OEM part


These are identical to the original part. I stripped the threading in one of the originals and needed a replacement, and this has worked great. Fast shipping and great service.


Bought a set of corebars at a garage sale, but they were missing the seats. etrailer was the only place I could find them, work and fit as expected.


I ordered this product on a Friday and was told it would arrive Monday. It came in on the Sunday, a day early. I installed it early Monday morning; it snapped right in and I was ready to go in about 15 minutes.


great replacement part for my car rack


Great product, delivered extremely fast. I’ll order from etrailer when ever I need similar accessories.


Excellent replacement parts. Worked like a charm. Would purchase again.


The replacement parts fit and work perfectly.


Exactly what I needed to replace a stripped/cross-threaded unit.

Brad M.


Still working great with absolutely zero issues one year installed on my car.


Due to an error in judgement on garage door height I needed to replace the CoreBar brackets for my Yakima rack. Etrailer was the only outlet that offered the exact components I was looking for at an unbelievable price.
The shipment did travel an unusual route to get to me but it did arrive within an acceptable time-frame.


It was great actually getting the part that I ordered and was also the part that I needed.
Will definitely return to this site if I need anything else.


It was the exact part I needed. Worked perfectly. Arrived sooner than expected.

Show More Reviews

See what our Experts say about this Yakima Accessories and Parts

Do you have a question about this Accessories and Part?

Info for this part was:

Employee Tyler C
Edited by:
Tyler C
Employee Jameson C
Expert Research:
Jameson C
Employee Wilson B
Updated by:
Wilson B
Employee Brian T
Updated by:
Brian T
Employee Daron K
Written by:
Daron K
Employee Andy C
Installed by:
Andy C

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.