Noob with a question

[J.Dirte]

Hello, I just wanted to introduce my self to the forum. I have been lurking about, reading old posts, etc for a few weeks now. I am currently a car guy, about to cross over to the truck world. My current project is a Mazda RX-7 with a Chevy 383/TH350. Its a fun car, but now I want a tow rig, and I can't think of anything better than a vintage truck to tow it to the track.

I do not yet have a truck of my own, but I am fortunate to have a friend with a couple of these trucks (in several hundred pieces) who is more than willing to sell me a starter kit.

Now, on to my question:
I have noticed that significant differences in the prices of some of the sheet metal components (bed panels, fenders, etc.) between some of the mail order parts houses. Is it safe to buy from the cheapest place, or are there differences in quality along with these prices? Can I expect replacement panels from any source to match up with the original body lines (barring any shoddy welding by yours truly)?

Thanks in advance for the help. By the way, this is a great forum... You can't find a knowledge base like this in a bookstore.