My 1972 F7 Dart Swinger

Interesting, str. I think you may be right. Unfortunately the foam is one year only and to my knowledge, nobody makes it. Hopefully he can find some seats with soft enough foam that can be patched in where necessary.
PG Classics sells the foam. you could use a 70/71 frame and foam with a 72 cover. I'd do a new frame but then I'd still have to buy the handles, tracks, seat backs, foam, etc. hoping to find some with decent foam then I'll just pick up some tracks. If I can find 72 seats, the foam will need to be in good condition since those aren't remade