The original rims were the 5 1/2" SIIa type (without the raised ring over the PCD) but the Army fitted the 6" Perentie rims AFAIK without changing either the stud or the nut.
You will however find that the original stud doesn't protrude through the end of the nut, however this was a SIIa Land Rover thing with double tapered over-length nuts.
I would be fitting the same rims that you have on the tow vehicle.
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