Firestone Coil Rite Air Springs. Coil-Rite Air Helper Springs are designed to fit inside existing coil spring suspensions. These springs are made of durable elastic polyurethane for years of comfort and stability. The Coil-Rite Air Helper Springs will fit most light trucks SUVs RVs vans mini vans and passenger car's coil spring suspensions for front or rear applications on models from the mid 1960s through 2003. Firestone's Coil-Rite Air Helper Springs adjust to varying loads and road conditions by inflating or deflating the air helper springs. Two polyurethane air helper springs (one for each side) supports buts bolts and clips along with air line tubing and fittings for a manual inflation system. Features of Firestone Coil Rite Air Springs Springs are designed to fit inside existing coil spring suspensions Spring tension can be altered as easily as inflating a tire Everything is included for easy installation The average installation time is approximately one hour using simple hand tools Package Contents: Firestone Coil Rite Air Springs Firestone 4100: 4100 Coil Rite Air Springs