Thanks, so you bought the pump and housing together. Did it fit up without problem, I guess it's really only the stud location in the back that is important, so it fits onto the bracket properly, and of course that the pulley lines up.
So if I have everything unbolted that needs to be, this pump should slide out of the housing, it's not happening.

I never got the pulley off the old pump, not an easy task. Assuming it's a normal Right Hand Thread, but I can't get it off.

Any part #s for a new Pulley and Nut to hold it?

I added these parts to a shopping cart in AutoZone - http://www.autozone.com/cart/cart.jsp - Pump looks just like the Cardone from AdvancedAuto, but it's a Duralast model.