Hex size for oil filter mounting stud?

Does anyone know the hex/allen wrench size to tighten the stud that the oil filter threads onto? The largest hex socket I have is 7/16 and that's still too small. Is it a 1/2? I'm replacing my oil filter adapter on my '01 Bullitt with a new one and need to swap the mounting stud over to the new adapter. Thanks!!!
 
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