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Maybe National Parts Depot, or LMC Trucks. If not and nobody else has any ideas you may be down to fabbing one up yourself. With the sheet metal and a bead roller it isn't the worst thing to do in the world.
Falcon.net, Falcon club of america, there is a falcon club chapter in a lot of cities. I am buying a 63 conv so I googled and there is a very wide array of suppliers.