This is the setup we've had on the boat for about 30 years. I assume gramp didn't like the non sensitivity of the original setup and had steel plates welded up with the step. I dont know dimentions so i've attached a pic. The lower forward edge was heated and rounded upward to ensure water always hits the bottom of the tab. These tabs are very sensitive. I barely have to touch the button to correct any listing. Hope it helps.
don't mind the "before" pic
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