Expert Robert1532 reports:
"I went to my MTD disc , looked up your model and looked at breakdown . I beleive you only need # XXXXX assy , everything else is just the breakdown of the complete assy .And you might need the scraper plate if it's worn ".
I think he is on the right track here..
But a little over simplified..
If you look at parts breakdown again, you see a reference 25 in a circle.
That is the one that he speaks of that points to the gearbox assembly.
It is hard to tell if it includes the part ref 53 or not(NNN) NNN-NNNNbut I think it may.
But it would not have ref 50 which is 711-04285 the 24" auger axle. because they are different with width of unit.
And still need
Auger Housing components 684-04069, 790-00120, and 731-04870
I will come up with a new list here shortly with prices..