Genuine OEM Audi Mirror Base Foam Gasket, part number 4M8857543. This left-side foam gasket is designed to create a weather-tight seal between the exterior mirror assembly and the vehicle body. Its primary function is to prevent water, dust, and road debris from entering the mirror housing and door panel, protecting internal components. Weighing 0.0041 kg and measuring approximately 21 cm long, this genuine OEM gasket ensures an exact fit and proper sealing properties, which is essential for maintaining the integrity and longevity of the mirror's electrical and mechanical components.