I don't know if you've already bought you're brake parts or not but I just found what appears to be 4 new wheel cylinders and assorted springs (I am assuming they're brake return springs) in the cab of a 1961 C-70 That I got some Parts off of. they are new in what remains of the boxes and have a little surface rust, but otherwise are in very good condition. I don't know if they are compatible with your truck or not, but if they are and you're interested I can get you some pictures. if not, I'll list them in the for sale forum.
