Replacement Base Assembly Cap for Thule Xsporter Pro

Question

Question:

Are the “black “caps” on the Replacement Base Assembly Cap for Thule Xsporter Pro Adjustable Height Truck Bed Ladder - Qty 1 # 8523168001, the same on the top and bottom? In my photo below, I am pointing to the bottom black plastic piece cap?. It seems that perhaps, I’ll have to buy the entire assembly to get the bottom piece. This is for my 2014 Tacoma, btw. Thank you for your previous reply.

asked by: Anne

1

Helpful Expert Reply:

The Replacement Base Assembly Cap for Thule Xsporter Pro Adjustable Height Truck Bed Ladder - Qty 1 # 8523168001 is the bottom part you are pointing to. They are the same on the top and bottom.

expert reply by: David B

1

Base Cap
(click to enlarge)

Ray S.

7/27/2026

Part number 8523168001 is for the top portion only. I also need the part the person in the picture is pointing at. Although in the picture it looks the same, it attaches in a totally different manner. Happy to send pics if you like. Thanks.

Claire H.

7/27/2026

@RayS If you're referring to the silver part, that is the Replacement Base Assembly for Thule Xsporter Pro Ladder Rack - Left Front or Right Rear Assembly Part # TH7521368001. If you're needing just the black plastic knob, that's the Replacement Rack Clamp Knob for Thule Xsporter Pro Ladder Rack Part # 852-3170001.

Ray S.

7/29/2026

@ClaireH Hi Claire, No, I'm looking for the black plastic piece on the bottom the finger is pointing too. You carry the top one, Above, you'll see your guy David B tells a customer who is looking for the same part the top and bottom pieces are the same, which they are not. I sent pics in a different inquiry. The top piece is: Replacement Base Assembly Cap for Thule Xsporter Pro Adjustable Height Truck Bed Ladder - Qty 1 # 8523168001. From the outside, the bottom piece looks the same, but attaches in an entirely different manner.

Claire H.

7/29/2026

@RayS I went out to the warehouse to check the bottom piece of the assembly, and I see what you mean. The bottom assembly cap tap has a hole for a screw to fit through to secure the clamp knob. I've reached out to Thule to see if they have this available as a replacement part.

See All (6) Replies to Ray S. ∨

Answer 1

The Replacement End Cap for Thule Xsporter Pro Truck Bed Ladder Rack #852-3214001 doesn't come with the screw to keep it in place. For that you need the Replacement M6-1x14mm Socket Head Cap Screw #THHD-27059.

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Answer 2

The correct channel cover you need for your older Thule Xsporter Pro Adjustable Height Truck Bed Ladder Rack is the Replacement Rubber Strip for Ladder Rack part #853-3544-23. I called my contact at Thule to confirm this.

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Answer 3

Thank you for the photos to help find the exact part you need! Looks like you are in need of the Replacement Rack Clamp Knob for Thule Xsporter Pro Ladder Rack #852-3170001 and a Replacement Base Assembly Cap for Thule Xsporter Pro Adjustable Height…

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Answer 4

We can help you tune-up your pre-owned Yakima Rocket Box rooftop cargo carrier with replacement parts. The page I linked for you displays all Yakima replacement parts for rooftop cargo boxes, including mounting kits, hardware parts and lid supports…

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Answer 5

Yes, we have heard from people with the PepBoys Voyager XL and the Thule keys do fit them. So the part #THKEYN2818 will fit and work well.

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Answer 6

Normally, using a system like the Erickson Big Bed Junior Load Extender, part #EM07605 is used with the rear hitch on a truck. Since you are planning on using this system on the front of your truck, I highly recommend making sure you have it secured…

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Answer 7

We have an option for you, but the pads like the Thule ones you mentioned are meant for roof racks, so what you can use instead for your Thule Xsporter Pro Ladder Rack #TH500XT or #TH500XTB is a foam block designed for ladder racks: - Malone Foam…

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Answer 8

Yes you could take just the uprights off and leave the 4 bases on the truck for the Thule Xsporter Pro ladder rack #TH500XT. To do that you would have to remove the end caps from the bottoms of the uprights so they can be removed from the bases. I…

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Answer 9

The Thule Interstate Rooftop Cargo Bag #TH869 that you referenced does not need to fit totally between the crossbars of a roof rack. If you check out the picture I attached you'll see that it can attach to a roof rack and set on top of the bars…

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Answer 10

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…

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Answer 11

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 12

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Replacement Base Assembly Cap for Thule Xsporter Pro

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