65 cuda rear top rails..Help

I have a 1965 cuda I need help putting her back together, my dad took her apart for paint and sadly he passed away and I don't know how to put the trim back on. It is the long stainless rails next to the rear window that run along the fender line. How do you put these rails securely on, do the need a rubber gasket....if so where can I find them and what are they called.