As I read this question, I was thinking of the vacuum tap just above the carb flange, just a standard pipe plug. Then I realized, kerosene manifold, there are plugs on both the front and back. If one of them is the plug in question, they are standard 7/8 Welsh plugs.
Next thought, there should be a stud on the outer side for holding the heat shield. If that stud is missing, I don't know if it is a through hole that would leak or not. If that is the missing plug, I'm sure it is a straight SAE thread, but I don't know the size.
In any case, you shoud be able to use standard hardware items. At least they are standard here, I don't know if they are standard in Australia.
So there are 3 different partial answers depending on how the question is interpreted.
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