Front Air Suspension Strut 2213204913 | Mercedes-Benz S-Class W221 Air Shock Absorber Our air suspension strut OE 2213204913 is a reliable aftermarket replacement air shock absorber designed exclusively for Mercedes-Benz S-Class W221 chassis. This integrated assembly consists of hydraulic damper, reinforced air spring bellow, protective dust boot, aluminum housing, equipped with electronic sensor to communicate seamlessly with the vehicle’s original suspension control module.