SmartRide's air spring for the rear of the 2006-2013 Mercedes-BenzÆ R-Class is a rugged aftermarket replacement air spring that will affordably replace your leaking air spring. The SmartRide air spring provides a smooth, comfortable, ride and offers an exact fit for quick installation. This spring is made with a durable rubber air bladder, impact resistant plastic top and bottom mounts. SmartRide's affordable air springs provide O.E. like form, fit and function and are designed for many years of trouble free driving.