AKG Motorsport Rear Shock Mounts Aluminum, Spherical 10 or 12mm – E30, E36, E46, Z3, Z4Product Description These BMW E30, E36, E46, Z3, Z4 Aluminum Rear Shock Mounts with Spherical Bearings are true, racing rear shock mounts that eliminate the deflection that occurs with the factory shock mounts. The stock rubber upper shock mounts deflect under load negatively affecting the rear shock damping, especially with a modified suspension and increased shock valving. Upgrading your stock rear shock mounts to our BMW E30, E36, E46, Z3, Z4