Both proto and gray brand 1/2" drive deep length sockets will do the trick. There will no doubt be others. Forget about spark plug sockets, they are too short internally.
I just went to the tool box to try some others out, and my 1/2 dr princess auto socket only barely makes it onto the hex, so I won't reccoment that socket. However I tried a westward 3/8 drive 13/16 socket and it fit well. Part number is DS386K.
Best bet is to take a spark plug to the tool store with you and try some out. Plugs are not in that tight, so you don't need top quality.
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