Genuine OEM Audi Door Mirror Base, part number 8K1857409E01C. This critical component houses the mirror's internal mechanisms, including motors and wiring, providing the structural foundation for the exterior mirror assembly. It is designed for the front left side of the vehicle, attaching directly to the door. The part features a 01C finish, typically a standard black or satin black. Weighing approximately 1.23 kg, it measures 0.39m in length. Using a genuine OEM mirror base ensures precise fitment, correct electrical connections, and factory-standard durability for reliable long-term operation.