1. Try JW Nova Parts out of VA (Or West VA I forget)
2 .Try Year One , Classic Industries
They also have websites.


3. Go to Barnes and Noble and get a GM Interchange guide.
You will find that anything from the Pontiac ventura, Olds Omega, Buick Skylark, and even teh Caddy Seville's from 1975 - 1979 might wrok.
Hope this helps.