Where to find parts for a Fairmont?

I recently aquired a 78 Fairmont Futura in hopes of making the ultimate sleeper. However seeing as how this car is older than I am, it needs some TLC. It needs mostly weatherstrip. I need the outer belt mouldings and the window channel weatherstrip. Does anybody know if these even exist in the aftermarket or know where I could get my hands on some good used peices? THANKS