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			I did some more research and I believe this page  is the closest. According to the cross drilling and slotting improve both cooling and pad contact.
 
Anker
		
				__________________2004 Boxster S Silver - FUNTOY
 2002 Boxster Base Guardsy Red - FUNBOX
 1987 Caterham Super 7 1700 Supersprint
 2009 Mercedes Benz CLK 350 convertible
 1941 Dodge Luxury Liner Coupe
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