Genuine OEM Volkswagen Left Front Door Mirror Glass, part number 5M0857521G. This mirror glass provides the essential reflective surface for the exterior side mirror, crucial for safe rearward visibility while driving. It is designed for the left front door mirror assembly, as indicated by the diagram. Weighs approximately 0.195 kg. Choosing genuine OEM mirror glass ensures optical clarity, correct curvature, and proper heating element integration (if applicable) for reliable performance in all conditions.