[chuckmynatt]

True007,

If John at Anthem Motors hadn't helped me out, I was going to pull a spring and bring it to a spring shop we occasionally use for our company trucks. I had already spoke with him and he told me he could make about any spring I wanted. For what I understand, the newer springs are around 30 lbs higher rate than the limp noodles you currently have. It's very difficult to see the difference in coil diameter. The height on the new springs looks to be exactly the same as the ones you currently have.
For what I understand, the springs are custom are not directly replaceable with a spring intended for and existing car.
If I were you, I would either have a spring shop measure your spring rate and provide another spring of the same height that has a 30 or 40 lb higher rate or contact Reg and try to aquire a new spring through Backdraft.

The best of luck

Chuck