I bought the AMP HD Max - U-shaped extension and it has more space than the V-shaped amp. HD Sport (sold by GM as OEM at an inflated price). The AMP HD Max installs easily, but be careful not to drop the nuts when installing them in the taillight area. I have a Bakflip G2 rigid folding tarp with two rails mounted in the side panel of the truck. This AMP extension deletes these guides as it rotates, so no problem.
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