Thanks a bunch for that, but so far haven't seen any genuine Toyota heads with that number
I don't understand what you mean by that. It's the latest genuine Toyota part number for the rocker head 2LT series. It's available from a number of Toyota OEM parts distributors. Just punch it into their part number searches.
From ToyoDIY, here are the models that part number came in (same as your list?). LN61 is most likely the vehicle your engine came out of, so this part number matches perfectly:
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