Firestone Ride-Rite all-in-one kit includes a Firestone air bag kit and a Firestone analog Level Command air compressor kit designed to fit rear applications on your 2WD/4WD Chevy Silverado and GMC Sierra 2500, 3500HD pickup. Firestone air helper springs offer maximum load capacity as well as years of worry-free service while the Firestone Level Command compressor provides equal inflation of both air springs from the convenience of your truck.