Genuine OEM Volkswagen Left Wing Mirror Glass, part number 3B1857521. This mirror glass serves as the reflective surface for the exterior side mirror, providing crucial rearward visibility for the driver. It is specifically designed for the left-hand side of the vehicle and for Left-Hand Drive (LHD) configurations. Weighing 0.137 kg, this glass ensures optical clarity and proper curvature for an accurate field of view. Choosing genuine OEM mirror glass guarantees precise dimensions, correct reflective properties, and compatibility with heating elements (if applicable), which are vital for safety and maintaining original equipment functionality.