This Genuine BMW Window Guide Web Cover is designed for the left side of the vehicle and is finished in black. It is a high-quality replacement part for your BMW and is designed to fit perfectly and function just like the original. This cover helps to guide the window as it moves up and down, ensuring smooth operation. It is made from durable materials to withstand daily use and maintain its appearance. This product is part number 51357044189 and is an authentic BMW part.