I have a carbon frame and the rear brake bridge is 30 mm thick excluding the countersink. The Campy Dual Pivot mount is only about 20 mm long.

I remember dealing with this before but I can't remember what I did. Is there a mount bolt replacement that is longer or a countersink nut that is longer? And where do you get whichever it is? I looked at a new set of Skeleton brakes and they also had the short mount as used in steel frames etc.