Replacement Adapter and Seat for Yakima JetStream and HD Crossbars - Qty 1

Part Number: 8880637

34 Reviews | 13 Questions

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Checking Out the Replacement Adapter and Seat for Yakima JetStream and HD Crossbars

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Replaces 1 adapter and 1 seat for your Yakima JetStream aero and HD 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 8880637 or order online at etrailer.com. Free expert support on all Yakima products. Great prices and Fastest Shipping for Replacement Adapter and Seat for Yakima JetStream and HD Crossbars - Qty 1. Accessories and Parts reviews from real customers.

Yakima Accessories and Parts - 8880637

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

Features:

Replaces 1 adapter and 1 seat for your Yakima JetStream aero and HD crossbars
- Works with 8000425, 8000426, 8000427, 8000428, 8000429, 8000430, 8001156, 8001157, 8001158, and 8001159

Lets you mount crossbar to Yakima BaseLine, RidgeLine, SkyLine, or TimberLine towers

8880637 Replacement Adapter and Seat for Yakima Jet Stream Aero and HD Cross Bars - Qty 1

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

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

Video review of yakima replacement adapter and seat for jetstream crossbars 8880637

Checking Out the Replacement Adapter and Seat for Yakima JetStream and HD Crossbars

Video Transcript for Checking Out the Replacement Adapter and Seat for Yakima JetStream and HD Crossbars

Hi, everybody. Andy here with etrailer.com, and today we're gonna take a real quick look at this replacement adapter and seat for your Yakima JetStream Crossbars. This is going to replace one adapter and one seat for your JetStream Aero Crossbars. And as you no doubt know, this is going to let you mount your BaseLine, RidgeLine, SkyLine, or TimberLine towers. For your reference, on your screen, I am including the model numbers that this is going to work with. And this is directly from Yakima, so you can have the confidence that this is going to work for you.

You shouldn't have any issues with compatibility problems, or fitting issues, or anything like that. Well, that's gonna 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:

96% were satisfied with this product

4% of customers were not satisfied

etrailer mistake
Product did not meet expectations

4% of customers were not satisfied

etrailer mistake
Product did not meet expectations

4.8

34 reviews

5 Stars		(29)
4 Stars		(4)
3 Stars		(0)
2 Stars		(0)
1 Star		(1)

by: Jeffrey 06/20/2026

I misplaced the original set for my crossbars so I ordered these replacements. Worked as expected.

by: Daniel 07/12/2018 One Year Later

Worked great. Had to buy them as I paired Thule bars to Yakima mounts/towers on our 2017 highlander. Needed them as the Yakima adapter and seat doesn't come with the Yakima mounts/towers; comes with their bars.

Was able to pair them with minor modification of the adapter and the combo works great. My wife liked the Thule bars more than the Yakima, but Thule mounts/towers did not work well in the Highlander.

Thanks etrailer for a great product and fast service and delivery.

Click to Enlarge

by: Ryan F 10/05/2017

I've bought a handful of things from etrailer to fit different racks and systems I have. Not only are these guys awesome at stocking the bits and bobs you need and can't buy from Thule or Yakima, but they guide you through the process easily and give you exactly what you'll need to get the job done. And, they ship fast!

Can't recommend etrailer enough.

Click to Enlarge

by: Jimmy 06/21/2018 One Year Later

Picked up some streamline bars are a R.E.I garage sale but they didn't come with these adapters. After some searching we found we couldn't just run around town to get these. Delivery took longer than expected (nearly 2 months), we even contemplated buying brand new bars which would have these included. Absolutely worth the wait because we use our racks weekly if not daily! We use etrailer for modifications and upgrades on all 4 of our vehicles, first place I tell friends and relatives to look when doing the same.

by: Matthew 07/15/2025 One Year Later

Replacement part was correct and fit.

by: Mark 03/29/2017

The Yakima adapters for the JetStream bars fit perfectly into my Timberline towers.

by: RE Hunter 12/11/2018

Fast service, great product, great tracking info too.

Re One Year Later

12/11/2019

Still extremely happy with the service and the product!!

by: Wolfgang 02/10/2021

Looked all over the web strainer was the one with stock and best price, usually my first stop when looking for hitch parts

by: Brian 01/20/2018

I ordered these pieces from etrailer.com for my Yakima system the pieces worked great I received them quickly and at a fantastic price I will definitely use this site again and recommend it to others.

by: Trace 11/28/2017

The clips were just what I needed and the shipping was right on time. Thanks etrailer!

by: Jose 11/29/2017

Product was exactly what i needed for my rack, 3rd party vendors sent my new yakima system incomplete and etrailer was there to help out!!!
AA+++++++

by: Erik 07/30/2018

High quality product. I’m only giving 4 stars because I placed the order, and it took weeks and a call to customer service to have them resend the order, before I received anything. Product is perfect

by: Casey 04/20/2023

As Always, fast shipping, very accurate info. Great prices! One for the best out there to deal with

by: David 01/24/2023

perfect transition from round bars to Jetstreams

by: Charlie 08/26/2020

This was an easy process. I was able to identify the items I needed, the purchasing process was easy, and I received my order in a timely manner. Thank you.

by: David 05/10/2023

Fast shipping just what I needed and exactly as advised

by: Roy 09/01/2020

High quality rack parts. Thanks etrailer.

by: Jason 04/10/2023 One Year Later

They do the job but have loosened up and needed readjusting a couple times over the almost 20,000 miles we’ve put on them since installing. Overall, good, just check periodically for loosening.

by: Kristin Wright 07/16/2017

Product is exactly what I ordered and needed. It was priced cheaper and the manufacturer or leading ecommerce sites. They shipped it out quickly and were very awesome

by: Jorge 06/01/2020

Items came well packaged and exactly like the description. Was great to find an online retailer that carried this specific part.

by: Aaron 06/08/2019

These were exactly what I needed and they came in a timely manner.

by: S 04/26/2023

Always works as expected. It’s great that you have the option to order cores that match your existing sets.

by: Sam G 06/08/2023

Great and timely service

by: Thomas 09/03/2026

by: Rod 08/11/2025

true

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See what our Experts say about this Yakima Accessories and Parts

Do you have a question about this Accessories and Part?

Can Thule WingBar Evo Crossbar Fit On Yakima SkyLine Towers
The Replacement Adapter and Seat # 8880637 is designed for Yakima JetStream bars but we do have a review showing them being used with Thule WingBars so it does look like they will physically fit together. With that being said, I recommend sticking with Yakima products just because if you do happen to experience any faults with the system (which there shouldn't be any) it would be a lot easier to work with Yakima or Thule if you can show that you're using the product as intended and you...
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Adapter to Connect JetStream Bars to BaseLine Towers
Hi Brett; they look the same but according to Yakima the # 8880637 is what you need for your JetStream bars. The other adapters are just for the HD bars. Yakima is usually pretty good about letting us know if things work even when they aren't designated to so I'll trust them on this one.
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Does the Yakima Jetstream Crossbar Come with Adapters For Baseline Towers
I have a solution for you, and in some complete roof rack kits the Yakima Jetstream crossbars # Y00425 will come with the Adapter and Seat for Yakima JetStream Crossbars - Qty 1 # 8880637. However, if you're adding crossbars to existing towers then you will need to purchase the adapters separately.
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Adapter to go From Yakima Skyline Tower to Jetstream Bar
To install a set of Yakima Jetstream crossbars to a Skyline tower you do need the adapter part # 8880637.
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Will Yakima HD Bar SL Adapter Fit JetStream Bars
The HD Bar SL Adapter # Y03541 is only designed for the HD bars. Since you have JetStream crossbars you will need the Replacement Adapter and Seat for Yakima JetStream Crossbars # 8880637 instead. This will allow you to use the bars with your SkyLine towers.
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Replacement Adapter for Yakima Jetstream Crossbar
While similar the two part numbers are different. The part # 8880637 is for the Yakima Jetstream style of crossbars whereas the part # Y03541 is for the Yakima HD bars. Because you have the Jetstream bars you would want the part # 8880637.
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Dimensions of Metal Nut on Yakima HD Bar SL Adapter 4-piece Kit Y03541
The dimensions of the rectangular metal nut part on the Yakima HD Bar SL Adapter 4-piece kit # Y03541 (their part 8003541) and the single piece part # 8880637 are shown in the linked image. The metal nut measures 1-1/8-inch x 3/4-inch. The overall height of the nut from the top to the wider base part is 3/4-inch.
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Do Yakima TimberLine Towers Come With Hardware for JetStream Crossbars
The TimberLine Towers for Yakima Crossbars # Y33TR that fit your 2013 Subaru XV Crosstrek do not come with any hardware, just a torque wrench. If you are looking to attach JetStream crossbars such as the 50" # Y00425 Black to TimberLine Towers, the crossbars have "seats" that will allow you to attach them (see accompanying cut out of the instructions). If you do not have these seats there are replacements available, the Replacement Adapter and Seat for Yakima JetStream Crossbars # 8880637.
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Dimensions of the T-Bolt Included with the Replacement Adapter # 8880637
The flat part of the t-bolt with the Replacement Adapter and Seat for Yakima JetStream Crossbars # 8880637 measures 3/4" x 1-3/16" as demonstrated in the attached photo. This adapter is compatible with your TimberLine towers, but was made by Yakima specifically for their JetStream crossbars. If you let me know the length of the crossbar that you need and which color (Black or Silver) you would like I can recommend the appropriate JetStream crossbars for you.
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Replacement Adapter and Seat for Yakima JetStream Crossbars
To replace your seat for the Timberline Towers, you'll need part # 8880637 which includes a seat and adapter to attach the JetStream Crossbar.
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Adapter Needed to Mount Yakima JetStream Crossbars On BaseLine Towers for Yakima Crossbars
It sounds like you're looking for the Replacement Adapter and Seat for Yakima JetStream Crossbars part # 8880637 which is what you'll use to mount the Yakima JetStream Crossbars like part # Y00426 onto the BaseLine Towers for Yakima Crossbars part # Y28TR.
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Recommended Roof Rack for a 2016 Ford Escape
To mount the two 50" Yakima Jet Stream Crossbars item # 8880633, you already own on the naked roof of your 2016 Ford Escape you will need the following parts: BaseLine Towers for Yakima Crossbars - Naked Roofs - Qty 4 item # Y28TR BaseClip Fit Kit for Yakima BaseLine Roof Rack Towers - Qty 2 item # Y06190 BaseClip Fit Kit for Yakima BaseLine Roof Rack Towers - Qty 2 item # Y06191 To attach the Jetstream Cross bars to the BaseLine Towers you will need 4 of the Replacement Adapter and...
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Replacement End Caps and Crossbar Seats for Yakima JetStream Crossbars
We can certainly help you with replacement end caps and seats for your Yakima JetStream Crossbars, like # Y00425. For a pair of replacement crossbar end caps, you will want the JetStream Endcaps # 8880636. This will provide 2 end caps for the JetStream crossbars. If you need 4 new end caps, you will want to order qty 2 of the # 8880636. To replace the crossbar seats, you will want the JetStream Bar Adapter and Seat # 8880637. This part number includes one seat and one bar adapter. If...
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Do you have a question about this Accessories and Part?

Info for this part was:

Expert Research:

Jameson C

Written by:

Wilson B

Updated by:

Daron K

Updated by:

Brian T

Updated by:

Michael B

Installed by:

Andy C

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