I have a used Sparco Roadster already mounted on Z rails with a Z seat belt buckle welded to the rail. Asking $400 shipped to the lower 48, I'll take $450 if you want it mounted on power seat rails w/ the switch, power forward and reverse.
Whichever set of rails you prefer, when you receive the seat you'll simply have to bolt it in and it'll be ready to go, no fabrication will be required at all. Email me if interested.
These are all pictures of the actual seat you'll receive, it will look exactly like this if you want the manual rails.
Follow Ups
Sparco Roadster mounted on Z rails w/ belt buckle - TriniTT18:01:42 02/26/08