Includes: â€¢ Main Oil Seal and Wiper Seal â€¢ Viton and Buna O-rings for all 2.0in. shocks with a 1-3/8in. Shaft â€¢ This kit may have extra O-rings; as it is designed to fit both Air shocks and Bump Stops aFe Control is proud to offer spare/replacement parts for the recently acquired Sway-A-Way line of High Performance Coilovers and Shock absorbers. This 2.0in. diameter seal kit includes all necessary seals and O-rings for rebuilding one shock. This kit is pre-packaged for all 2.0in. diameter Air shocks and Bump Stops that have a 1-3/8in. shaft. This aFe Control Suspension product is designed and engi neered in our Corona; California facility.