Genuine BMW Window Regulator Front Left (335i 335i xDrive) - 51337119067: Genuine BMW Window Regulator Front Left (335i 335i xDrive) - 51337119067 is designed to replace the original window regulator in your BMW 335i or 335i xDrive. It is an OEM (Original Equipment Manufacturer) part, made to the exact specifications of your vehicle. This window regulator is designed to provide reliable operation and a smooth, quiet ride.