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the factory spec for the '78-80 930 front floating rotors is 35.7+0.25-0.35mm. measured from the brake flange bearing surface on the hub to the rear friction face(as pictured above)
for the later '81 up it is 56.7+/-0.1mm
the later rotors have greater o/s because the 21mm spacer that is a separate part on earlier car is incorporated into the later 1 piece rotors, these would not one would assume -yes
used w/ SC/Carrera fenders.
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