The Genuine BMW Side Window Rear Left - 51377259713 is a replacement part for the side window on the rear left side of a BMW vehicle. It is an authentic BMW product, ensuring high quality and compatibility with the vehicle. This side window is designed to fit and function just like the original, providing a secure and weather-tight seal. It is made of durable materials and meets all BMW specifications for safety and performance. This product is a crucial component for maintaining the integrity and functionality of the side window on the rear left side of a BMW vehicle.