I temporarily installed '79 210 seats into my 1200. I used the 1200 seat rails and had to do some minor mods to the seats, but nothing terribly drastic.

I put Mazda Miata seats into it a month or so ago, and modified the Miata seats rails to go into the 1200. No holes were drilled into the floor, but I did fabricate some rear mounts that were welded to the floor.