Heehee....
Saw some interesting examples this year at the Vegas meet.
John Nguyen's Silver 86 7MGTE. Both of his front seats came out of a MKII MR2 Turbo... Yes, you do have to do some fabrication, they are not a straight bolt in.....
At the last minute at the end of the Show N Shine, when Roy Cruz pulled in w/ his Red 84 w/ that monster 7M-GTE of his, I did happen to notice some tan MKIV leather seats. Didn't have time to look at his interior & how the seats were mounted, pretty sure that you have to fabricate as well. Since that "thing" of his is basically nothing more than a 1/4 mile drag monster, side/side lateral support is kind of a non-issue.
Should have gotten a picture of his car, but I didn't. This is what happens when you "assume" that he'll make it later to the drags & the dyno later that weekend (Jim Coble said Roy was unable to get the car tuned in time).