lmc or classic industries

[Skunksmash]

Most of the time I use this one:

http://www.classicparts.com/

They often have NOS parts, though sometimes they are grey and unpainted. They will say something like "original GM part" and when you order it its got GM logos on it. They're pretty good, once they shipped me the wrong fender trim and I told them I shouldn't have to pay to ship it back cause they're the ones that gave me the wrong one. They sent a new one free and didn't make me ship back the old one. Guess its just gonna be a spare.