Try
www.joesrustemporium.com for any and all trim. I cannot say enough about the quality of trim he has, or ask if he has good used. Any level, he's probably got something. Also, try
www.dvap.com or a place called Memory Lane old auto parts, I think in CA, 1-800-281-9273. And of course, the ebay auctions- I have seen from time to time.