Any spec differences between the rear coil springs on on AHC-equipped 2006 LC versus 2006 LX? They have different part #'s. I was about to order springs from a factory parts vendor, and the issue of the different part #'s came up. Is it possible that the LX springs are softer for a cushier ride? If so, could the LC springs be used instead? Or is the AHC system dialed in to the specific spring specs of the respective vehicle, assuming there is a spec difference?