Thanks...I do have 2 sets, and they are all the same height just don't know about the "rebound" part. I guess I could stand on them, but how do I know how "far" they are supposed to go down. I was reading some previous posts about springs from coilsprings.com, they offer one that has a rate of 180lbs (for extra weight), vs the stock of 150lbs...wonder if these would do better with the Koni shocks I have. decisions, decisions.