A-Body newbie... interchange question(s)

Hey Guys -
I ought to be picking up my 75 Dart Swinger next Wednesday and have started to search for some parts and just some general information.

I'm wondering if you can share some basic knowledge about what kinds of parts might interchange between various years, makes and models...

you know, panels, glass, interior and exterior trim... things like that.

I would like to get my hands on the trim pieces for both the front windshield and back window but wonder if by only looking for 75 Dart Swinger trim I might be limiting myself.

Please school me!