StreetGRIP composite lowering leaf springs improve your 1967-1970 Mustang's handling, ride quality and stance. The composite design reduces unsprung mass by more than 50 lbs whle increasing torsional strength to diminish "spring wrap". Billet leaf spring eyelets have the correct offset to achieve lowered stance for your vehicle. On the street and around our exclusive test track, RideTech works in conjunction with Hyperco, our technology partner, to ensure the best engineered springs for your car. Bushings are sold separately.