That would be the No.3 cylinder head cover gasket.
It is a Toyota dealer only gasket.
It is held on by those 4 14mm allen head bolts.
Those bolts thread into the oil gallery.
Without this gasket, oil will seep from the 4 14mm bolts.
If you take it off and throw it away, like I did, You must use big oil drain plug gaskets under each of the 14mm bolts.
Bring one of the 14mm bolts to NAPA and they will be able to hook you up with the correct size gaskets.
Just for future reference, these bolts are the problem with oil in the spark plug wells, 99% of the time
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