73 Rear window gasket?

I don't think those clips have anything to do with the vinyl top. All cars had the trim around the window (see here: http://www.valiant.org/photos/dart/1970-swinger.jpg). I'm fairly certain those clips are all the same since the trim was the same design for all the cars. I'm guessing the only difference is that the clips were installed over the vinyl, which would necessitate a thinner gasket. They're still screwed into the roof itself, not the gasket, and they are used to attach the same trim, so I can't think how they'd be any different.