spindle question

Hi All, I just bought an almost complete disc brake set up with small bolt pattern. It is the 4 piston calipers, I may have spare calipers. I am looking for a hub for one side. I have new rotors but need just the hub and one caliper attaching bolt. Might be able to match bolt up locally to the 3 I have. I am pretty sure that the lug studs get driven out to separate the hub and rotor and re-attach by drawing lug studs back in, making it a pressed assembly. Does anyone have a spare hub? Thanks, Alan "medicineman"