DR Airmatic part AK-0008 is a remanufactured aftermarket Rear Left strut assembly for the Mercedes Benz 2007 - 2013 S Class W221 Sedan with Airmatic, shock absorber assembled with a new air spring bladder and improvement seal and also Hydraulic and Damping Solenoid Valve was been testing in good working condition. Features: Easy Installation Fit: 2006-2013 Mercedes Benz S Class W221 with Airmatic and with Adaptive Damping System Reference OE/OEM Number A2213205513 A 221 320 5513