http://www.kawasakipartshouse.com/oempa ... 0-e4-parts
These are the ones I have (packaging got wet and disintegrated). Can anyone tell straight off which one the waterpump seal is? Just trying to figure out if I have it before attempting the job.

I also found this one lying around:

Lastly:
1-I read elsewhere that one should do several oil changes afterwards to clear out all the water? Is this necessary? How many should I do? Just keep at it until it's a nice oily colour? Should I start the bike and ride it for 2-3 minutes to shift through the gears before changing it?
2-I suppose I should also check/top up my radiator if necessary?