Pump Shaft With Bearing
Here is a factory pump shaft and bearing from Berkeley Jet Drive.  This kit comes with the thrust bearing pre-greased and installed on the shaft.  This will make your pump rebuild go easier since most boaters do not have a press in their garage.
This kit includes:
1 Stock Impeller Shaft
1 Shaft Sleeve
1 Thrust Bearing
1 Snap Ring
Labor to install the sleeve and bearing