Diamondback 270 8' Hard Tonneau Cover. This came off my 2021 GMC 2500 Sierra HD, with an 8' bed. All mounting hardware is present. Key can be seen in the lock. Never had a leak or any sort of sealing issues, even with the multi-pro tailgate. I sold the truck and the buyer didn't want it.
I am not a Diamondback fit expert, so I can't confirm it will fit all 8' beds. Here are the following measurements:
Overall Length: 101.5"
Across behind the Cab: 71.5"
Across middle: 69.25"
Across at the tailgate: 67"
I would recommend having at least 3/4" of lip on each side.
$1,400 OBO (reasonable)
I can deliver and assist on install if required, depending on distance from Bennington, NE.