Hi there. Newbie here. I just built a trike and used the fork assembly from an 2 XJ550J (I think). First question, how can I be sure of the year and model? It came off a Yamaha with a 550 cc motor. I need to replace the steering stem bearings as there is considerable up and down play on the push/pull test. My supplier wants me to rip everything apart and get part numbers off the existing bearings. I don't really want to start ripping everything apart if I don't have replacement bearings in hand. Second question, did these come with ball or tapered roller bearings. And third question, What are the dimensions of the existing bearings or what were the original part numbers?