This product is a genuine BMW window guide designed for the left rear door of a BMW vehicle. The part number is 51357310317. It is a high-quality replacement part that is specifically designed for BMW vehicles. The window guide helps to keep the window in place and ensures smooth operation when opening and closing the door. It is made from durable materials to ensure long-lasting performance. This product does not contain any newline characters and can be used as input in other API calls.