i was told there are two different types of dana 60's for chevy, the standard chevy dana 60 took four u bolts and the not so common that took three u bolt and two bolt threaded into the axle, i have the dana 60 that requires the two bolts, the axle didnt come with u bolt plates but i could beat the deal i got on it, is there a spacer that goes between the u bolt plate and the axle or are the bolts exsposed?