The shocks are listed as 5100, but then for the different lifts im assuming the model # is different by size. I originally had a 5.5 Superlift kit - Can you tell me if I would order your 5.5 kit and the lengths and model numbers for the front and rears provided in your 5.5 5100 kit. Thanks!!

You are correct. We have different length shocks, for the different lifts. If you have a 5.5 lift, or 5.5 kit shocks should work, as long as you have the stock shock mounts. Otherwise, we would measure from mount to mount, with the weight on the vehicle, for a resting height length. Also, take note of how each shock mounts, as there are eye/eye versions, and stud/eye. The kits for 5.5 uses #'s Bil88118 and Bil88123.