I see WOpp has already offered you one, but I will chime in with a bit of help too.
I took one out of my Super WD-9 that had 3 cogs cracked and years ago my neighbour broke all of the cogs off of his WD-9 snow plow tractor and he thought that the hard push of plow caused it to break the cogs--he is probably right.
I think you would be okay with your show tractor with the shaft you have but if you are like me, you will probably want to fix it right.
A clutch shaft out of a W-9 or WD-9 might also fit but I am not sure. The part numbers are slightly different between those and a 650:
W-9/WD-9 is 58610DA
600/650 is 58610DB
The last digit is the only difference in part numbers which might mean that there was some minor improvement made to the original part (Ford auto parts work that way--I am not sure about IHC). Regardless, a W-9/WD-9 clutch shaft would be easier to find and might be in better shape since they weren't subjected to as much horsepower.
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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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