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For stock class you can't change springs....but can use longer bumps that are giving you an effective rate increase. These are suggested as part of a complete stock class autocross package that includes our Racing Beat tubular front bar, blocks and bolts to reinforce the mounts, and our adjustable KONI SPORT shocks. Same part also works for our customers with Bilstein, KYB and Tokico shocks. Includes four (4) bump stops only. The 1999-2005 does not require spacers or washers. Listed in the order used on the car, 58 Red is Front, 58mm White is Rear.