BMW Millimeter Differential Bearing Replacement Kit (up to 1999) Seeking the highest quality solution to restore your BMW's differential performance? Our set is tailored for mm differential types, distinguished by their bolt-on side caps securing the carrier unit, prominent in models up to 1999. Compatible BMW Models: 3 Series: E21 (big case), E30, E36 5 Series: E28, E34 7 Series: E23, E32, E38 (early models) 8 Series: E31 Z Series: Z1, Z3, Z8 Depending on your BMW model's engine, we offer three differential sizes: 4-cylinder: 168mm 6-cylinder: 188mm 8-cylinder: 210mm Symptoms of Differential Bearing Replacement Need: A notable noise emerging from the differential during acceleration and deceleration is a key sign. To differentiate this from wheel bearing sounds, try swerving as if you're warming tires for a race. Persistent noise indicates the need for differential bearings replacement. Included in the Set: Crush sleeve Small pinion bearing Large pinion bearing Side bearing (x 2) Input flange oil seal Output flange oil seals (x 2) Trust in Racing Diffs for OEM quality components designed for longevity and optimal performance.