Hotchkis Sport Suspension 1930 1964 1/2 - 1970 Ford Mustang Coupe Fastback and Convertible Front Coil Springs with 0.5 or 13mm drop. Take your 1964 1/2- 1970 Mustang to the next level of performance for autocross and track days. Hotchkis Front Sport Coil Springs are one of the fastest easiest and most dramatic modifications you can make to the Mustang offering a sleek lowered stance dramatically improved handling and superior driver control thanks to a lower center of gravity. Our engineers poured over computer modeling and track testing data to create the ultimate Mustang coil spring that improves handling while offering a sporty yet comfortable ride. Designed and manufactured by Hotchkis Sport Suspension specifically for the 1964 1/2- 1970 Mustang our street autocross and track event ready Sport Coil Springs were developed as part of a balanced system giving the Mustang an aggressive stance and balanced handling especially when combined with Hotchkis Rear Sport Leaf Springs Sport Sway Bars and 1.5 SPS Shocks. Precision wound in the USA from the highest quality high tensile steel they are finished in Hotchkis durable gloss powder coat. Specifications: Fender-Edge to Center of Rear Wheel (at Lowered Ride Height): Coupe/Convertible 12.5 Fastback 12.5 Spring Rate: 700 lbs/in Drop: 0.5 or 13mm.