all the series II's I have seen have said so on the head tin or the air cleaner.
regarding what style air cleaner lid, the one in the pic looks like the one on my most recent K341 pick up.... on another note, (yeah I know, not Cub but still applies to a KT engine) the owners manual for one of my other tractors shoes a "cold weather air cleaner kit" for the twins.... and no mention of differentiation between a Series I or Series II being applicable.
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