kerscher rear vented discs?

[roo]

I think i've opted for the kerscher rotor on cb spindle with the 944 4 pot caliper up front. Seems simple enough. For the rear i'd like a similar setup but can't find any kerscher vented rear rotors. I would just use 944 rotors but don't want to widen my rear track. Does kerscher make a vented rear rotor adaptable to 944 calipers that doesn't widen the rear track? If so how much and could someone offer a link. i've searched csp's site and couldn't find vented rears and the kerscher site is in german and i'm not too proficient.