I just did this this 2 weekends ago.
Got seats from a '91 Talon(eclipse/laser). (seat ~17" wide and tracks ~13" wide)
PERFECT condition, $100 at my local bone yard.
The 2 front mounts holes line up without any alteration.
I even used the bolts from the Talon.
The rear 2 mounts holes did not line up.
I needed to drill a new rear hole in both sides of each rail. (simple)
I also trimmed the length of each rail by removing about 2" from the rear of each track. (not neccessary but gives it a cleaner look.)
It took about an hour to mount both, with some cleaning rust proofing my floors.
The hardest part for me was getting my big hands in and around the rear bolts to make them up.
The fit is nice, both seats operate fine.
I am 6' 2" and I have a sunroof.
My head can now hit the roof in certain positions (If I try to hit it).
A helmet would be annoying to wear now.
The seats are about 2" higher than my old original '71 seats.
I only got 3 bolts in the passenger seat, I dont remember why?