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All of AP Racing caliper P/Ns start with a "CP", you write "pa"...
If you do have a CP6635 and not a pa6635, the CP6635 calipers were designed for 366-mm discs http://www.apracing.com/product_details/road_car_upgrades/factory_big_brake_kits/bmw/m5_applications/m5_e60-rear_4_piston_kit_cp6635-1000.aspx
:facepalm
If you do have a CP6635 and not a pa6635, the CP6635 calipers were designed for 366-mm discs http://www.apracing.com/product_details/road_car_upgrades/factory_big_brake_kits/bmw/m5_applications/m5_e60-rear_4_piston_kit_cp6635-1000.aspx
:facepalm