Precision Engineering: Our window regulators are carefully designed for reliable performance. For BMW For E90 E91 For 325i 328i 330i 335i Rear Left Right Power Window Regulator Easy installation: This window regulator is a direct replacement part making the installation process quick and simple. The function of a window regulator is to ensure that the window glass can be raised and lowered smoothly and that the opening and closing operation is seamless. INSTALLATION: Direct replacement for window regulator for easy installation., Manufacturer: JSRVQKMS