Can anyone identify these trim tabs?

Bennett yes.

From my limited experience with them, and if you're planning to buy those, you may want to get new transom plates since the old ones are likely to have bent during removal.

They are around £30 a pair from someone like PH Marine - and sounds like you'll need the switch anyway.
 
bennett switches are expensive but all you really need is two dual pole rockers.
(3 way, on1 off on2)
 
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