Genuine BMW Side Window Seal Rear Left Lower - 51368119963: Genuine BMW Side Window Seal Rear Left Lower - 51368119963 is an original BMW part designed to provide a secure seal between the window and the body of the car. It is made from durable rubber and is designed to fit perfectly on the left lower side of the rear window. This part is essential for keeping out dust, water, and other elements that could damage the interior of the car.