Hi,
The water pump pulley is integral to the pump itself, it cannot be removed. If it is wobbly as you describe, I suggest that you have a bad bearing and the water pump will require replacement. The part # is: Coolant Pump - 996.106.011.53 - $230, Gasket - 996.106.340.51 - $7.
This is a pretty straightforward replacement if you have a moderate to advanced skill level. Hose clamps and a U-joint Socket are needed as well as a torque wrench. You'll also need to replace the coolant, silicone-free type. I wouldn't hesitate to do this repair myself, but I'm fairly experienced. A dealer may cost upwards of $600 or more for this job. Sorry to be the bearer of bad news...
Happy Motoring!... Jim'99
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