They sell a dry sump for the ZX12.
Is it OK?
http://www.paceproducts.co.uk

No direct experience with a zx12 kit, but if Pace make it, I would say yes....

You could also try Extreme Engines - www.extremeengines.com.

That is where I bought the dry sump for my GSXR1000 and it is a nice piece of kit.

Bought my locost off a guy who worked there, he kept it in their workshop. He showed us around and everything was top notch quality.

Adam