i have a 1992 sea ray 220 bowrider i/o. it has 2 rear seats on both sides of the engine comaprtment. the seats are square cushions that can be set low(as a seat) or high and flush with the engine cover making a sundeck. im looking for the piece that the seat will rest on that is screwed to the side of the boat. theres 2 on each side of the boat. the engine cover has the inner ones built in. i dont know what to call them or where to get them. can anyone help???