Well the bearing is HK type, im sure you know what kind of needle bearing it is (if not just google it). A shop has some but they arent so cheap, they are 16eur/piece. If you are intrested I can order a few more for you. As for the bushing, i was thinking that instead of bronze I would use a steel alloy. Its very hard and heat resistant. It would be polished like a piston pin is, to insure the bearing rolles over it smoothly.