Hopefully these help. They did make a 10 and 12mm slant fin. The case will tell you what it is. If is a straight fin, its is 12mm. Slant cylinders have better stock timing numbers, and wake up even more with simple muffler mod and shaving a touch off the flywheel key. 12mm are rumored to have a bit more torque, but either of them flat run.
My 044 is a 10mm case, that had a straight 12mm cylinder, I rummaged through my junk and found a good slant to put on it. It's my go to for bigger stuff. Pulls a 24" no problem.
I look forward to your findings.
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