SK-3039 is an Arnott designed new rear shock for the 2003-2009 Mercedes-Benz E-Class (W211 Chassis) and 2005-2011 CLS-Class (W219 chassis) with or without 4MATIC and with or without rear load leveling, excluding AMG. This new shock, which fits both the left and right side, includes a custom valved and thoroughly road tested shock which provides an excellent ride. This twin tube shock includes a new polyurethane bump stop, new top and bottom mounts and a protective dust boot. The new replacement E-Class rear shock is assembled in the USA.