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For an extra 9mm of stack height you will want at least 9mm of extra length on the bolts. I used M6 countersunk high tensile bolts with a 17.5mm length: M6x17.5mm
Ultimately I ended up removing the Bilsteins and installing KW V2 coilovers. I would not waste time adding spacer plates on the Bilsteins since the reduced shock travel means you are constantly on the bump stops and ruins the ride quality of the car.
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