[Blas]

Tonneau covers from Superformance chassis actually interchange quite well. The Lift-a-Dot posts in the body are installed using a standardized jig. Even though there has been more than one jig used over the years they still exchange well. Major difference in the covers are the two Tenax fasteners used on the newer chassis. But these two fasteners and pins are easy enough to swap out. Feel free to contact me if you want to know how to swap them out.
Added Info:
It was further mentioned that the cut-outs for the rollbar and steering wheel may have shifted position slightly over the years. I could see a possible small movement in the steering wheels location from when they raised the cowl in 2001 (maybe around chassis #1200) to allow different style engine installations. But as to any shift the rollbar location, I have no clue. FYI: I have replaced my standard hoop with Olthoff's taller hoop. Everything still fits fine.