Well as for the push on plastic pulleys.

I've been taking a few printers apart to see if I can get spare parts. None of them have the same stepper motors though in square casing.

They did have a lot of plastic parts such as gears and pulleys.
I just used a screwdriver to push them off.
You do have to be gentle though, since I was looking for parts, otherwise you may break the plastic pulleys.

I had problem printing circles, seller offered to give me a refund to buy metal pulleys though. Refund not sent yet though.

This one also has a template to help get the drill holes in the right place.
http://www.thingiverse.com/thing:232678