The Genuine BMW Seal Outer Left Mirror Triangle - 51337373931 is a replacement seal for the outer left side of the mirror triangle on BMW vehicles. This seal helps to secure the mirror triangle in place and prevent water and debris from entering the mirror housing. It is made from high-quality materials and is designed to fit perfectly on BMW models. This product is an authentic BMW part and is an essential component for maintaining the integrity and functionality of your vehicle's mirror system.