In the Spec lines, certain cars are given specific alternates such as larger sizes for rotors/drums. This overrides the PCS.
Don,

I'll throw this out again. Based on your logic above, a full-prep GP or FP Spitfire would only be allowed to run 7" or 8" rear drum brakes. Ask Sargis or Allen if they're running rear drums or their cars.

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MARRS #25 ITB Rabbit GTI (sold) | MARRS #25 HProd Rabbit
SCCA 279608