I'm in the process of rebuilding my support arms and have recently purchased the support arm pin and bushing kit #304600k group 15.5051 from Max Merritt. I've just noticed in my master parts manual that this originally had roller bearings forward and aft, group #15.5055 part # 326765. I would rather use bearings verses a bushing, but I don't seem to see this bearing available anywhere and would need four. Any opinions on this before I install the bushings and are these bearings available anywhere? (1937 "120" lower suport arm pin)