Stock BMW rear shock mounts are made of rubber, and overtime crack and wear out. MTS Technik has taken it up a notch and provided the last rear shock mount you will ever buy. These are machined from high quality, lightweight aluminum and anodized to prevent corrosion. They feature a uniball bearing design and a polyurethane bushing to last for years to come. All rear shock mounts feature gold zinc coated hardware and a 2 year warranty. Features: 2 year warranty with no mileage limit High quality anodized aluminum Double gold zinc coated hardware Reinforced uniball bearing Polyurethane Bushing Fitment: E30, E36, E46, Z3 If you want to run these on other suspension setups, this is a popular modification. Please see the product picture for strut measurements to ensure these will fit your rear shocks.