The Bilstein B4 Series 44-400200 is a premium OE replacement air suspension strut designed specifically for the rear right side of the Mercedes-Benz S-Class (W223). Engineered to restore the original factory ride quality and handling comfort, this monotube air strut integrates seamlessly with the vehicle's electronic suspension systems. Features include high-pressure gas technology and precision valving for maximum safety and stability. Component List: 1x Bilstein B4 Air Strut Assembly (Part No. 44-400200).