Hotchkis Sport Suspension 1900R 1964 - 1966 GM A - Body Rear Lowering Coil Spring 1 in. Drop. Lower your Chevelle El Camino GTO or other 64 - 66 GM A - Body car with Hotchkis Sport Suspension lowering coil springs. These springs will lower your vehicle on average 1 in. from factory ride height enhancing vehicle looks while lowering the center of gravity. The increased spring rates offer improved performance and handling while offering a comfortable ride. Each gray powder coated coil spring is precision wound using the highest quality steel. Specs 1 in. Lowered Rear. 124 - 159 lbin. Single Pig Tail Coil Note Wagons and El Camino's should not use rear springs without the use of 31750 air bag kit.