All aluminum front suspension system for 1964.5 -1970 Mustangs featuring Detroit Speed's unique suspension geometry with 6" of suspension travel for the ultimate in ride and performance. Spring Rate: 400lbs/in Spring Free Length: 10inDouble Adjustable w/ Remote Canister: This DSE/JRi shock has all of the qualities of the double adjustable shock and incorporates a gas charged bladder to provide high frequency and low speed dampening control. Remote Canister Shock Mounts: These billet aluminum shock mounts are manufactured for securing your remote shock canisters to the vehicle. The shocks mount with two 1/4"-20 x 1/2" button head screws.