Inside Rail Clamping Tonneau Cover Adaptor
Inside Rail Clamping Tonneau Cover Adaptor

Inside Rail Tonneau Cover Adaptor

Starting at $178.50


Tonneau Cover Adapters for Inside Rail Covers - 40XXX Series. Made with reinforced steel construction, which ensures high strength and rigidity, and a protective layer of black powder coat to resist scratches, chips, and corrosion.


Designed for covers that attach to the inside rail of the trucks bed rails. 40XXX Series Kits include everything required for installation except the BACKRACK™ Frame.

Unlike the previous 925XX Series, a separate Hardware Kit is not required for purchase. Example:  Louvered Rack for 2016 Sierra would require - 40120 + 12500.

Tonneau Brands Compatibility Chart

BACKRACK™ Tonneau Cover Adapters work with select Tonneau Covers. To find out if your tonneau cover is compabitble, click here to see the Tonneau Cover Combability Chart or use our Build My Rack Tool.


Install instructions are kit specific.


1 Year Warranty on workmanship; Powdercoat finish not warrantied


1 Total
James H.
4 / 5
30 December 2021
Back Rack
Got it for a close friend that wanted a place to mount a light and not have to put a hole in the roof of the truck cab. 2014 F250 crew 4X4 with a fisher plow.