i was looking around some junk yards today for manual hub parts to convert. i found some axles for $65 a piece, and a left spindle for $150. here's my question. one junk yard said they had some prerunner spindles for $100 each, now I know the add and non add spindles are different but what about the prerunner spindles? are they different than both the other spindles? also, are the rotors separated from the hub like the add hubs? or are the hub and rotor on the manual hubs one piece?