Body Panels

AMD.
The closest you will get to N.O.S. or very good used original.
Don't waste your time on Goodmark or the cheap hand formed panels.
Goodmark were actually designed to fit over your existing panels (or what's left of them) which is bogus IMHO (and they are thinner to boot).
Have a close look at Swinger340Canuc's build thread for some great pictures and step by step descriptions on the A.M.D. stuff and how it fits.