These inner springs allow for a Progressive Bump Spring Assembly - these springs must be used with our Progressive Bump Spring Retainers - some older retainers are not machined to fit them. Inner springs are 1 1/2" tall.
Choose from 4 different rates 200-300-400-500
200 and 300 pound springs will fit shafts up to .625 OD
400 and 500 pound springs will fit shafts up to .590 OD
White outer spring not included in pricing - only used as reference for inner spring size.