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^afaik the ID of the rotor hat is the same (both 160mm, so the 'small' bmw parking brake.
But the depth of the rotor hat is afaik much deeper on a z4 (so the rotor has a different offset).
Its because the z4 has a different bearing flange at the rear (and the z4 has thus a wider track at the rear)
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Z4 3.0i | ESS TS2+ supercharger | Quaife ATB LSD | Brembo/BMW performance BBK front/rear | Schrick FI cams | Schmiedmann headers+cats | Powerflex/strongflex PU bushings | Vibra-technics engine mounts | H&R anti rollbars | KW V3 coilovers/KW camber plates | Sachs race engineering clutch | tons of custom sh#t
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