The classic Mini's differential pin can sometimes wear badly, or even break in competition use, due in part to the uneven load applied by varying tolerences and poor machining of the planet gears. By adding a bronze bush to the planet gear, excessive play and wear are reduced. This set includes two specially bushed planet gears, thrust washers, uprated differential pin and roll pin. Ref: C-BTA167, C-BTA0167, 2A7062, DAM5071, DAM6624, DAM6027.