Genuine OEM BMW Front Strut Bump Stop, part number 31336782871. This component acts as a secondary spring and travel limiter for the front suspension strut, preventing the assembly from bottoming out during heavy compression. It is located on the front strut shaft. Made from high-density microcellular polyurethane, it is engineered to absorb energy and protect the strut seal. Genuine OEM bump stops ensure the correct density and compression rate for factory-specified suspension travel.