C55 and C32 have the correct brackets for the 6 and or 8 piston calipers to fit Crossfire hub smaller distance from bolt to bolt on the caliper are all the same just diff hub on c55 and c32.

8 piston are a little taller on the hub so wheels are a bit tight. But the wheels you see in this pic and the AMG knockoffs are able to fit the 8 piston calipers