I just checked with all of the parts stores that I deal with daily at the shop and all say that the rear springs are solid parts and listed as non wear items. None of them will carry the part that wont make them money. It is rare for any of us to go from a lowered set up back to the stock height. I do respect what you are doing though. I personally dont think I will lower mine because I am constantly trying to get lowered cars onto the alignment rack and it is irritating at times.