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Moral of the story is there is likely a bearing retainer made to fit whatever your combo you just have to do a little resurch.

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I'm a 904 guy but I had a mag somewhere w the diff retainers MP introduced way back that iirc they had one for the OD (5.125") case but was 4.8" dia & gotta pay attention to if a 307 or 308 bearing behind it. Way back I had a bell machined out to 5.125" & that eliminated part of the L bracket for the fulcrum but there was enough flat area of the "L" left so they drilled 2 mounting holes next to the ones that got (partly) eliminated w the OD increase.