I'm glad this topic has come up again. I have the orginal springs in my 69 Z and after the years, as expected it has sagged. The problem is the driver's side is a 1/2 inch lower, however i am happy with the ride height on the passenger side. I thought about new springs, but I don't drive the car much so I was concerned about the time it would take to settle. Also, I thought it was better to keep the originals. Since I was not sure what to do I have left them on. So, what I'm understanding here, is that I can purchase Eaton springs and have them de-arched to my desired ride height or let them know the height I want and they will make them to per my request? Then should I hang on to my old springs, since they are the originals?