I called Marathon Boat Group and they have currently halted production for the yokes for lack of material for the pads. At least that is what I was told.
So, does anyone know where they might still be stocked or have a used one for sale?

You can just simply install a wooden yoke if you like.

Thanks Bannock I was just coming around to that idea. I would have preferred Grumman's piece, but anything is acceptable to save my neck. :)