SK-3311 is an Arnott designed new rear damper for the 2003-2009 Mercedes-Benz E-Class (W211) and the 2005-2011 CLS-Class (W219) without ADS. This universal twin tube shock, which fits both the left and right side, includes a custom tuned and thoroughly road-tested damper which provides a smooth ride and excellent performance. Included in the Arnott design are new top and bottom mounts, a polyurethane bump stop, and a protective dust cover. This aftermarket Mercedes-Benz rear shock is designed, tested and assembled in the USA.