Im getting more and more certain that the rear springs on a 2010 GT are 2005-2009 GT500 Springs. Not only are they 166 lb/in but the 2010 sits 0.5" higher than the 2005-2009. I was at the dealers measuring and I get a consistent 7.5" from ground to lowest point on the front LCA bolt on 2009 but 8.0" on the 2010.
The GT500 rear springs have exactly the same free length (by measurements) as the BB Data Plate (BC Spring) that came on my base GT Deluxe. So to me it appears it would have to have a taller installed height since its 17% stiffer.
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