Genuine OEM Audi Left Side Mirror Housing, part number 4K1857409G9B9. This component serves as the primary structural mount for the exterior side mirror assembly, providing the base for the mirror glass, motor, and cover. It is positioned on the left side of the vehicle, typically near the front door. The housing features a Satin Black (9B9) finish. Weighing approximately 1.316 kg, it is engineered for durability and precise fitment. Using a genuine OEM mirror housing ensures correct mounting points, proper integration with electrical components, and resistance to environmental factors, maintaining the mirror's stability and function.