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change the backing plates, hub and rotor (spindle too if one is the old, and one is the new design) i.e. My D44 HD 3/4 (1973) has my 1989 10 bolt knuckles and tie rods and the D44 spindles---> out bolt right up.
PM wes for a more DETAILED(!) rundown, buts all you have to do in a nut shell