Here are the dimensions handed to me by a buddy on another forum.
Seat rail thickness (from the bottom of the seat to where it bolts to the floor.)
5-3/4" at lowest
Distance between bolts on the same rail. (front to rear bolt distance.)
inboard rail: 15-5/8" , outboard: 15-3/4" (hole center to hole center)
Distance between seat rails. (from outboard to inboard, preferably from the mounting bolts)
front: 14-1/8" , rear 15-1/8" (hole center to hole center)
Width of the seatpan at the bottom and width of the seat cushion at it widest point.
21-1/2"
Width of the back at bottom and top.
bottom: 21-1/2" , top: 18-1/2"
Measured from a 90 SC seat
If my measurements are correct on the floorpan, it should fit quite nicely. A little snug, but it should still fit. My only concern is retaining the functionality of the power controls with them being so close to the rocker rail. If my measuring is correct, I have 22.5" from where the seat pans end on the trans tunnel and the rocker rail. That leaves a half inch to play with on each side. I may be relocating some electronic controls.