This product is a Genuine BMW Tail Light Gasket designed for the left side of the vehicle. The part number is 63217046137. It is a gasket specifically designed to fit and seal the tail light on a BMW vehicle. This gasket is an authentic BMW part, ensuring high quality and proper fit for your vehicle. It is used to prevent water, dust, and other debris from entering the tail light assembly, protecting the electrical components inside. This gasket is essential for maintaining the proper function and appearance of your BMW's tail light.