When we first bought the used machine in the early 70's it had the auger on it. We took it off and the frame and found a dozer for it that we mounted later.
Here are some brochures that seem to be the same type that was on it.

Hi, jsk.
Int'restin'. A 'multi-tasking' Cat.

Just my 0.02.

I think I know where it is (maybe). My parents had some land that the dozer was originally at, and when I was young they bought the D2 [It was a CN rail used machine] via a friend (who was a diesel mechanic for the city of Toronto) . I helped him at the time ( 1970?) remove the auger, frame [side or rear seat if I remember] etc. at that location in a bush area of the land. It may still be there and I will check (not too far from where I currently live).
John