Tim,
I wanted to know the bore diameters of the kerscher m/c as well, so I asked Kerscher by mail. (Fortunately I speak a little german).
They are 23,64 mm front and rear.
They actually also sell another option that has 19,00 mm front and 23,64 mm rear.
IMO the m/c are a product development of their own.
I also heard from MTM in germany that an Audi (model 100 or 200?) m/c could be used when you use porsche 944 turbo brakes on a beetle. Don't know the diameters of those. Costs new about €250,--, so the Kerscher part is cheap in comparison...
Hope to have been of some help.
Good luck,
Walter
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