Vehicle Compatibility: This rear air springs kit fits 1998-2008 Grand Marquis and 1998-2008 Crown Victoria with Rear Coil Springs Only; 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: Coil-Rite air spring kits come with all of the pieces necessary for a fast, simple installation; Install time averages one to two hours, and most Firestone Coil-Rite kits are no-drill Smooth Ride: Coil-Rite air helper springs adjust easily, from side to side, with independent inflation valves to support a smooth ride and even load distribution; Maintaining a balanced load lessens body roll to enhance vehicle stability Weather-Resistant: Shifting temperatures won't throw a wrench in your plans when you drive with Coil-Rite air springs; Coil-Rite air springs were designed to work in temperatures between -40F (-40C) and 180F (82C), North or south, summer or winter