The Genuine BMW Window Guide Left Front Door (XLine) - 51317311261 is a high-quality replacement part for the left front door of BMW vehicles. It is specifically designed for the XLine model and is made from durable materials to ensure long-lasting performance. This window guide helps to guide and support the window as it moves up and down, ensuring smooth operation. It is an essential component for maintaining proper functionality of the window and ensuring a secure seal when closed. This product is an authentic BMW part and is designed to fit perfectly and seamlessly into the vehicle's door.