From your pictures it looks like a lost cause. I suggest selling it to me cheap and get another. grin
Just kidding of course. I have bought a lot of body parts & patch panels from American Classic Trucks and have had some fit good & some that need to be "altered" a little bit. They all need a little customizing I think, no matter where they come from. I have heard Dynacorn makes pretty good panels but have never used them. If I can save a few bucks I don't mind a little cutting/welding/filling.
It is hard to tell from your picture, but if you wanted to replace the back panel because of the right cab corner I would straighten the panel before replacement. Maybe repair the dented area and just replace the lower corner secton. The back panel is about $400 plus shipping and a lot of work. The lower panel is $26.00 & about $15.00 shipping, and no where near as much work. You can check my Photobucket link and see where I have replaced the lower sections.


1957 Chevrolet 1/2-ton Stepside LB in the Gallery
My Photobucket shots

The person who has nothing for which he is willing to fight, nothing which is more important than his own personal safety, is a miserable creature and has no chance of being free unless made and kept so by the exertions of better men than himself." - John Stuart Mill (1806 - 1873)