This product is a genuine BMW Channel Seal designed for the outer door of the rear left side of the vehicle. It is specifically designed for use on BMW models with an Alu Satiniert finish. The part number is 51357298921. This channel seal helps to provide a tight seal between the door and the body of the vehicle, preventing water, dust, and other debris from entering the interior. It is made with high-quality materials to ensure durability and a perfect fit for your BMW. This channel seal is an essential component for maintaining the overall appearance and functionality of your vehicle.