Hey guys, I'm a lurker on this site and have been reading here for several months hoping to find the right van someday. However, I got an e-mail yesterday that I thought could be helpful to everyone, especially the home built guys. LMC is a company that makes reproduction parts for old pick-ups and they sent me an e-mail that they are now carrying parts for full-size vans.
I've bought quite a bit of stuff from them in the past for trucks and they've always had great service. It looks like they carry parts for Ford, GM, and Dodge vans.
Here's the link to their webpage.