I have a standard 2008 c63 with standard single piece disks (grey calipers). My cousin has a 2009 pp also with grey calipers but has the dual piece disks costing about 2 grand rather than £200. They now differentiate between the newer models by grey and red callipers. Hope this helps.
All the callipers are the same brembos I believe just with different discs. They seem to be the same sizes so don't see any reason why standard discs can't go on a pp and vice versa. The reason the callipers are red is to indicate performance pack plus which has an extra 30bhp. Only really notice the difference if tracking in my opinion. Others may think otherwise.
I know this is really daft but these are defiantly the measurements for a C63, 2011, Coupe with PPP (front red 6 piston callipers)?
I have been searching the web all over and could not find a thing.