I replaced my entire floor in my 53 1/2 ton .I found a complete pan at Monroe antique swap meet for $5.00, good thing I had my trailer. After that I ran into a fellow in Hope ,BC and he had a floor pan still attached to the rear of the cab for $50.00.I saved the pan and traded the back section (cab corners were good) for all the braces under the box boards.I live at the swapmeets, so far I've found every rust free panel for my 1/2 ton ,including fr and rear fenders, box,gate,doors for under $300.00.Prepped for paint and driveable (350/350), I'll be into my truck for under $1,000.00.The only problem is ,it'll be another year to three before it's finished.My time for working on it is very limited.I'm still looking for a drivable one ,so I can drive one now.