You may have luck trying a company called Southern Truck Parts (?) in Imlay City, MI. (I'm pretty sure that's the name, funny how you drive by a place everyday and can't remember!) Call info, they'll have the number. They specialize in 'rust free' parts from, you guessed it, down south. I called 'em once, checking for a long box for a 79, and they said they had one, be glad to sell it to me for (((gasp!))) $1000! Uh huh, I found a parts truck, and got it for $450. It's solid, just gotta get a floor kit from Shermins (spelling?) which is supposed to be much better than the thin stuff from JC Whitneys. Shermins sells lots of body stampings, have 'em in stock, and from what I've been told, is very high quality. Ofcourse, I don't have thier # here either, but can dig it up for ya. If you want more info, PM me. (I think Shermins is located around 29 mile & Van Dyke area if your in Southeastern MI / the Thumb area).