Valiant Headliner Install

I'm planning to install a new headliner. I've done an E body before but not an A body. A few questions a) does the rear glass have to come out? b) if so, does the glass push out of the rubber seal or does the glass and rubber come out together? c) best place to get the headliner? Alot of vendors don't seem to list a '68 Valiant. Is it the same as a Dart?
Thanks!