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:shock:... That should not happen really, because OEM (correct) nuts are hardened.
Try with a regular file; if it grabs and actually removes material, discard those nuts and get the good ones.
Not a problem.
Good; that means you (or a machinist) can still modify them for the correct chamfer. Not a big deal - if you have the right tool.
And to keep this simple, even a conical (non-spherical) seat at 55° taper would do.
Compare yours with the dimensions shown below...
It seems to me that Ø "B" is within specs but Ø "A" is definitely too big...?
FWIW, "A" is 1.22" for the wheels on Deuces and M37s, and around 1.28" on HEMTT and FMTV wheels.
Since we are talking about stud-piloted steel wheels, even that...