If you look at the two spindle assemblies you posted, the 618-0609B assembly has a longer spindle shaft than the 618-04657 assembly. If I am looking at the drawings correctly the right spindle assembly (when you are looking at the rear discharge chute) is 618-04657 and the left spindle assembly is 618-0609B. If you just ruined the spindle shaft you can purchase it separately, but then I would also replace the bearings. Hope this helps.
Perfect! Thank you very much for your help in pointing me in the right direction.