SmartRide's air spring for the rear right or left side of the 1997-2002 Ford Expedition (UN93) 4X2 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 along with impact resistant plastic top and bottom mounts. SmartRide's economical replacement air springs provide OE like form, fit and function and are designed for years of trouble free driving.