I just talked to Ron, at Rusty Ron's Marine Salvage/Island Marina, in Morehead City, NC, and he said that he may have the part. (252-726-5706) He is close to the GW factory, and buys up their surplus parts at the end of production runs, and has a big warehouse, and yard, full of parts for GW and others. He buys in bulk, so does not always get a detailed breakdown of parts numbers, or what models they fit, and would need a good pic of the whole piece, and a couple of measurements, say corner-to-corner, top to bottom, etc, to narrow it down.
I told him that I was helping a friend find a part, and that you may call.