Big Gun shocks are specifically valved for high horsepower rear shock applications. Recommended for applications 1,000-1,500 hp. Both small tire and big tire cars can better control the hit to the tire with this series of shocks. This configuration fits rear stock location of 1969-02 Camaro/ Firebird, 1953-'62 Corvette, 1962-'67 Nova/Chevy II and many Ford rear applications including 1979-'93 Mustangs & 1965-'86 full-sized cars. 13.25" comp x 20.15" extended length. May be ran as a coil-over with #20135D kit and 14" tall spring sold separately.