Prybars, hammer, airhammer, whatever it takes. You can get a little rough with the rotors if you don't plan on keeping them. The technique I used that worked best is to hit the rotor really hard right around the wheel studs to knock some rust out of the inside. Then pry behind one side of the rotor while wailing on the other side with the hammer. Switch sides back and forth a few times and hopefully it will fall off. Sometimes the springs holding the parking brake shoes will break but that's no biggie. Don't get too pissed if it takes a while, it's taken me overhalf hourtrying to get those things off.

 

The axles probably aren't the same length as the factory mustang stuff.