Can someone help me out with spring rates? I have no clue which would be appropriate for the rear. No matter what I cannot continue using my FK rear springs since they rely on the spring perches which are absent on the FocusCentral control arms. Im trying to get my bud over in Germany to talk to FK about what rates they would recommend to compliment their front coil-overs but Im having a hard time describing my problem in a way he can understand (slight language barrier issues).