Brian,
Attached you should find images of a C01UC 100737 B and C01UC 100737 C the wide one is the "B" version. All of the Canadian ones I have handled seem to be marked as part of the casting process and some of the markings can be very faint.
I believe that the hole sizes are the same for all Canadian ones but i am not near them right now to be able to measure.
Colin
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