This product is a genuine BMW finisher for the window frame on the rear left door. It is designed to be used with gloss black paint and has the part number 51357209143. This finisher is meant to be used as a replacement for damaged or worn out window frame finishers on BMW vehicles. It is made with high-quality materials to ensure durability and a perfect fit for your vehicle. This finisher is an authentic BMW part, ensuring the highest level of quality and compatibility with your BMW.