I have been searching through Kohler's parts lookup. I think Matt is correct in that what I was given today is indeed an M12.
Now here is something weird I have found on Kohler's site, the crank used in the M12 471536 is the same crank used the K321 60312. Back to more research. I may just use this M12 crank, the price is right and if it doesn't work out, I am just out some time.
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