Front Shockwave Air Ride System 1958-1964 GM B-BodyHQ Series Single AdjustableUse with Ridetech StrongArmsRequires Air System Features'HQ (Handling Quality) series shock features adjustable rebound shock valvingImpact-forged bodyLarge 1.834 in. pistonsHeavy duty 5/8 in. shaftAdjustable ride height24 rebound adjustment clicks Does NOT include air compressor system, ShockWaves only.