Vehicle Compatibility: These Coil-Rite air springs fits 2004-2026 Sienna Not AWD or Hybrid models, 2005-2009 Uplander and 2005-2007 Relay; In-bed hitch is not compatible What's Included: Air springs, hardware, air line and separate valves for manual inflation, the same as you would use for inflating a tire; everything is included for a quick easy installation Easy Installation: Your air spring kit includes everything needed for a quick, hassle-free installation which no drilling is required, with average install times under two hours Prevents Damage: Coil-Rite air springs help prevent bottoming out by cushioning the interaction between the axles and frame, protecting your vehicle from damage and ensuring a smoother ride Levels Headlights: Improves handling and braking performance even on rough roads or under heavy loads, while also helping reduce tire wear and maintain properly aligned headlight beams for safer driving