At the bottom of the standard QA are 2 sets of holes/slots. If the narrower set fits the lock pin location of the MT55 (mini-QA) then it will lock on. If you want to convert the auger for permanent use, once the auger is mounted to the MT weld an angle iron at each side of the QA to act as alignment guides so it is easier to hook up nest time.
When ever using an auger on QA always raise lift arm up high enough to look underneath the QA to make sure the pins are locked in place before curling the auger down or turning it on.