They are different systems, so you will have to use a Bader arm to mount a Bader wheel. The wheels come without the bearing spindle, so make sure you get the set.
The contact wheel spindle is mounted into a recessed hole by a 3/8" bolt with a wheel handle. This makes for quick changes.
Other tools, like the flat platen, mount in a through hole on the split end of the arm. There is a bolt that closes the split and pinches the accessory firmly in place.
There was another wheel mount style that screwed into the socket hole, but I think that is an older type.