Boom , I have a 51 3800 here, would be mostly the same as yours other than i have wing vents in the doors. I'm curious about your dual wheels. Dual rears were not an option for a 3800 tonner. You would have had to buy a 4100 tonner to get that. Someone here made duals for my truck. Are your tires 17"? You can use parts off any other AD truck for anything above the frame. Tonner frames are thicker, have more and differnt cross members than the 1/2 and 3/4 ton ones. Master cylinders are easy to come by, i get all mine at the local parts stores, along with the wheel cylinders. I have never had to buy any brakes shoes, but if the metal part is good, you can get them relined at most better machine shops. Theres a guy on here named Bruce, that has a lot of NOS brake parts, i just got a pair of rear cables for my 47 2 ton, fit just like they should. Put a post in the wanted section and I'm sure he will see it and let you know that he has some for your truck.