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bought m/m hubs for my 78 f150 and come to find out that some fords came with short axle stubs. i marked the axle and widen the grove for the lockring.they work great. the m/m hubs don't have the grove in back of the center locking part.so if you buy a set of these hubs you'll have to have the longer axle outer shafts or widen the grove. I hope this helps someone