The Daystar ones are shorter than the factory ones, but its due to them being built out of a harder material. The factory cab mounts are a foam rubber, and when the cab comes down they squish to the same height as the Daystar mounts. I've done two so far with no issues. However I do have a complaint that I've addressed with Daystar, the cab mount pockets on the frame have a bigger cut out than the Daystar mount have on them. So you do have about 1/4 - 1/2" of adjustment NSEW that makes it a pain when lining them up with the the holes on the cab. Other than that no issues.