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I've got KHRL-46SL in mine, which is this height. Its basically on the borderline of legal with how low the exhaust hangs on these. I probably wouldn't go any low for scraping/legal purposes unless you could tuck up the exhaust closer to the body.
I think you will find they are standard height springs with a stiffer spring rate.
Check the part number though as mine were KHRL-46SL. You didn't have the SL on the one you listed