8 3/4 spool questions ?

the spool requires green bearings. its a better setup, over tapered bearings and spacer. also, green bearings let car roll easier, no bearing drag!!! if you use a spacer and tapered bearings and take it apart, spacer might drop out?? there's nothing in there to hold it. like a stock diff has. the k.i. s.s. method is best.