Arnott's second-generation rear air spring for various GM models eliminates many of the common problems associated with the older OE bellows design. These aftermarket air springs feature a state-of-the-art tapered bladder designed to provide an unparalleled ride quality. An upgrade from the original, this new air spring's design features CNC-machined crimping rings used to hold together the heavy-duty assembly. The crimping rings ensure durability, as opposed to the loose-fitting, snap-together original design, making the second generation air spring more dependable. In the spirit of evolution, experience for yourself Arnott's stronger, more dependable air spring, the next generation of GM suspension technology. This part fits either left or right side.