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Those are standard HMMWV 37x12.50 tires on 16.5 inch HMMWV rims, the exact same you will find on the trucks.
I may have one tire/wheel combo for sale if you need it.
To muddy the waters a bit, there was also the M116A2E2, an A2 with an offset axle and HMMWV wheels/tires as well as fender...