Ordered a set of Ground Control coilover sleeves to pair with my Koni STRs. Ended up getting custom rates (wanted the same rates front and rear). I was looking to get 300 lb front and rear, but unfortunately they do not make anything that soft for the 5" long spring. Hopefully i won't regret such a stiff setup. But, they should be okay paired w/ the Konis.

Front:
5" long spring and 425 lb/inch
Part#: GC 125.64.75

Rear:
7" long spring (1" shorter than standard because rates are stiffer and wont sag as much, suggested by GC tech) and 430 lb/inch
Part#: GC 180.64.75