I generally agree with what has been said above. There are some differences, but nothing that you couldn't make work if you needed a door. It is still a good idea to be aware of what you're doing though so that you know what you'll need.

I do have some pictures of a 70 challenger door, and also a later door which I believe is a 71 or maybe 72. There are also other differences in the later 73 or 74 doors. My research on this subject is not yet complete. I don't have time to find the pictures and post them at the moment (on lunch break). I'll try to see if I can find them later. Maybe they will generate some conversation and I'll learn something new.

Tav