Genuine OEM Audi Door Mirror Base, part number 8T1857409AJ3FZ. This component forms the structural foundation and houses the internal mechanisms for the exterior side mirror, enabling adjustment and folding functions. It is designed for the front left-hand side of the vehicle, integrating into the door panel. The part is finished in Black 3FZ, ensuring a consistent appearance with other exterior trim. Using a genuine OEM mirror base ensures precise mounting points, correct electrical connections for mirror functions, and durability against environmental elements.