It would make sense, in the interest of carrying less spare parts in the supply system, to make the left and right the same. So to that end, you would have to go with 1/2 inch, since that was required to handle the load of turning 2 wheels. The left side only had to handle the load of turning one, so in that case 7/16 studs would have sufficed engineering wise.
Checked a 44 Chev 15cwt Sigs van that is apart and sitting about 30' from me. Sure enough, 1/2" threaded holes on the left side and the C01Q-3348 part number on the casting.
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