The Genuine BMW Window Guide Web Cover Left - 51357177957 is a high-quality replacement part for BMW vehicles. It is designed to cover and protect the window guide web, which helps to guide the window as it moves up and down. This cover is specifically designed for the left side of the vehicle and is made from durable materials to ensure long-lasting performance. It is an authentic BMW product that is guaranteed to fit and function properly. This window guide web cover is essential for maintaining the smooth operation of your car's windows and ensuring they stay securely in place.