Check with Jim Carters and Chevy Duty. It is likely, that you will need to talk to someone that does auto upholstery. Especially if you have a particular shade in mind.
I think most of the guys and gals either go with whats available, or get creative and just do it themselves. I have seen lots of nicely done interiors by fellow Stovebolters. This site has probably the largest group of do it yourselfers
around.
"Quote"
Does anyone know where to find tan interior pieces (door panels, headliner, seat cover, etc.)??
Visit the the fabric shops, check out what paint colors are available, talk to some upholsterers.
Stovebolt Up!! You can do it.
Hang in there, I'm sure that if anyone has seen the tan items that you are looking for, will let you know.
Good luck
John