Genuine OEM Audi Exterior Mirror Mounting, part number 2E1857507A. This component serves as the structural base that secures the entire exterior mirror assembly to the vehicle's door frame. It houses the internal mechanisms for mirror adjustment and folding. Typically constructed from robust metal and durable plastics, it provides a stable and precise attachment point. Using a genuine OEM mirror mounting ensures exact fitment, proper alignment of the mirror, and reliable long-term performance, which are crucial for maintaining visibility and the structural integrity of the mirror assembly.