That's very odd - I just ordered door seals from Justmopars only yesterday. Same nice guy told me he represents (and is the "road guy" for all the major shows for parts vendors) for Metro Molded Parts.
I will say that I did have problems with some roof rail seals a few years ago for my son's '74 Dart Sport. I couldn't use them because of what I can only describe as a molding error. I wound up re-using the old seals and tossed the brand new ones in a storage container. I need to dig them back out and get the brand name and a few pictures of the problem so you guys can see what the problem was.
Jerry