73 Rear window gasket?

Hello! Drove my car through a torrential downpour today(first time its rained since I got it). It started raining inside the car from the back window. The car is a 73 dart swinger that was originally a vinyl top car. The previous owner removed it it and all the trim to make it a non vinyl top car. If I replace the rear gasket do I have to still use the vinyl top style gasket or can I use the ordinary gasket? I guess what im asking is, is there any difference between the two styles in the glass or is it just the gasket and trim?