This is the shaft the goes from the gear box to the chain sprocket.
This is a set of used auger gear cases from a Simplicity 755 snowblower, in great condition. Cases have 3/4 bushings and seals. These are the same cases used on the larger 560, 760, 860 etc machines. You would need to remove the current bushings/seals and install 1 seals. To use in this application.