LOOKING FOR SPRING HELP.. What would be the better choice xhd or ss. I am running 12.5 in. wide tires and trying to find clearance for tire. Springs that are on car I believe are ss but older set. Tire on driver side sits lower by 1/2 in. Passanger side has three in. of clearance from top of tire to bottom of well. I prefer the rear of car to be level. Also, any suggestions of choice of shock.