Yukon Gear Minor install Kit For Model 20 DiffThis kit uses pinion depth shims that differ in design from the OEM pinion depth shims. OEM shims go between the rear pinion bearing and the pinion head. The shims in this kit go between the rear pinion race and the housing. This Part Fits: Year Make Model Submodel 1968 1970 American Motors AMX Base 1978 1979 American Motors Concord Base 1979 American Motors Concord DL 1979 American Motors Concord Limited 1977 American Motors Hornet AMX 1970 1971,1973