The Bilstein 17-21 BMW 530i xDrive B4 OE Replacement Shock Absorber - Front Left is a direct fit OE replacement shock absorber for the BMW 530i xDrive. It is designed to restore the original performance of the vehicle's suspension system and improve ride quality and handling. It features a monotube design with a gas-pressure construction and a seamless cylinder for superior strength and durability. The shock absorber is tuned for each specific application and is made with corrosion-resistant zinc plating for long-lasting protection. It is backed by Bilstein's limited lifetime warranty.