The Genuine BMW Window Guide Web Cover Left (Gloss Black) - 51357187211 is a replacement part for BMW vehicles. It is designed to cover and protect the window guide web on the left side of the vehicle. The cover is made of high-quality materials and has a glossy black finish to match the aesthetics of the car. It is an authentic BMW product and is specifically designed for a perfect fit and function. This cover is an essential component for keeping the window guide web in place and ensuring smooth operation of the window. It is a durable and reliable replacement part for BMW owners looking to maintain the quality and performance of their vehicle.