New water pump, what to do with fan?

So I am replacing my water pump, had to order the new one, just got it in today, and I'm not sure how to go about getting the fan onto it. Here is a pic, kinda a bad pic but I can take more if you guys need it to see what's going on.

There is no kind of fan assembly like the old one already installed, so I'm wondering if I have to pull the old one and put it on this new one, or what's up with all that. It has four holes that look perfectly sized and spaced for my fan, but if I just mount it on as is, I have no idea where the belt is suppose to go to actually make this all spin. Any help would be awesome.