I don't mind Alan. And I'm sure no one else does either.

A new from Suzuki cylinder isn't going to be cheap. Maybe you can find a nice one on eBay?
That is a possibility, but I can't figure out where the rust would come from. The Zilla has a steel "freeze plug" in the clutch cover, and I'm unsure if the 250 has it or not. Coolant doesn't touch the steel part of the head gasket or sleeve, so that's not it. The only other place I can think of it the mechanical seal behind the impeller. It has exposed steel.

That's good. That's not really a passage anyway. Goes somewhere in the cylinder side, but nowhere in the crankcase side. I never did figure out why that was there...