Bearing Kit, Differential, Spherical Bearings, Aluminum HousingReduce wheel hop, and increase the handling ability and traction of your 1979 2004 Mustang with differential housing bearings from BMR Suspension. These bearings are how the upper control arms directly connect to the differential, making it crucial to a proper functioning rear suspension system. Manufactured from CNC machined billet aluminum, with heavy duty Teflon lined spherical bearing, BMR? s BK074 differential bearings can stand up to nearly any