This entry is for a pair of Vorshlag alloy steel upper reinforcement plates for the Rear Shock Mounts (RSM) on BMW E30, E36, E46, Z3 and Z4 models. This product entry is for one pair of these plates and is enough to reinforce both RSMs on the BMW models shown above. These are made from alloy steel, are zinc chromate plated, and are thicker than the factory (Z3) reinforcement plates.
Many BMW models are prone to cracks near the rear, upper shock mount bolt holes from both street/track use with higher cornering loads (and higher damper forces) as well as normal street use over extended time periods. Bolt these steel reinforcement plates on top of the rear shock tower sheet metal to strengthen this known weak area and prevent these cracks. Can be used with OEM style rubber RSMs or spherical RSMs. Can be bolted or welded in place. To install just place above the shock tower, underneath the RSM top nuts, as shown below - takes mere minutes to install