Rusted rear cab supports

[gws56 3100]

Hey guys, I resently purchased a 56 Chevy 3100. I have been surfing this forum for a couple months trying to get an idea of where I want my build to go. I am in the process of disassembling the truck to see what I have to work with. Like most other trucks this age, some good some bad. My first order of bussiness is going to be rust repair on the cab. Some patches I will buy and some I will try my hand at making the patches. Something I have come up on is the rear cab supports that are attached to the cab mounting bolts. Here is a pictures. I can't seem to find them anywhere. If anyone know where I could get them, new or used would be fine.