I currently have a pair of RH spindles with a casting number of 459756. But both spindles have a different outer bearing .ID. One of them takes a .750 and the other one is .843,,,can anyone explain this to me? Also the spindle with the .750 I.D. is about 5/8" longer at the pin. What I mean is there is about 5/8" different in spindle pin lengths. I thought all Metric spindles were the same. Help please,,,,Rodney