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I'm yet to replace this part on my bike, but it appears that it fits onto the engine similar to the way the oil pump would fit on old school big block Mopars, where it's driven off of the crank via a shaft, vs. a an external belt.
You'll also notice that it doesn't have any sort of gasket for interfacing with a coolant jacket in the engine block. If you're having a leak where coolant is leaking into the crankcase oil, then one of the following is your problem:
1. The leak is not actually at the water pump. (Cracked block or head, leaking head gasket, or something)
2. The pump housing itself is cracked along the portion that sticks into the crankcase.
3. The seal on the water pump shaft has failed, allowing coolant to leak past it.
Given this, I would ask you, what makes you so sure the problem is the water pump, and not something else?
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