Re: 1971 rear window leaks. HELP!
I just checked my rear window on both my '71 coupe and '71 fastback. The fastback rear window is over twice as tall as the coupe rear window (~27.5" vs ~12.5"). I don't see any way to stretch a rear window gasket for coupe to fit a fastback. Even if you could, it would skinny up as it is stretched and probably would not seal at all. My guess is that there is foreign material between the gasket and the body.