So the 7A1 and 7A2 were variations used on the early 11 and 12 cabs.
With the Cab 13, they went to the 7B2 body. Later, in order to correct some of the deficiencies, there was a final body in the 101 wheelbase, the 7B3, which is not commonly found in Canada.
There was a plan for a longer CMP 150" 6x6 wheelbase tractor based on the 7B3 body, but I'm not sure it ever came to fruition. The reasons for the longer one was to increase capacity and flotation. I suspect the difficulty of operating with the limbers may also have been part of the reason. Limbers were a throwback to the horsedrawn era, and not overly suited to mechanized transport.
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