Ran across a guy down here in Naples FL working for Insignia Auto Body parts.
He said they handle "older" cars as well.
I went to thier website but have not turned too many stones yet.
http://www.insigniaparts.com
what i have see is the limt to 1989 in year. Dono if they go back further if you call them or not. Looks like they supply everything though.
Seems like most companies that sell body parts (i.e JCWhitney ect.) Limit their years to only 1989. There is a place in Nashville called Auto Body Panels. From the looks of it they fab a lot of stuff themselves. May check it out one day.
I think it's a 20 yr limit. Guess we'll find out next year.