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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.