I'm looking at a '52 3/4 ton flatbed. At the rear of the bed frame are 2 "brackets" that extend down to hold the frame to the wood supports. One appears to be all there but the other seems to be missing the bottom half. Does anyone know if these parts are available, and if so where, or will they have to be made?

 

Welcome to the forum! Those "bumpers" are as they should be. The long one on the right side is to support the bed as the wood bunk is cut away on the side to access the spare tire.
Mark