If it's flat, get a sheet of acrylic (Plexiglas/Perspex) and make your own. Use very fine toothed cutting blade with soapy water as a lubricant to get the rough outline. Final shape with a router.
have you tried your local rv store they know more then you think. they might even find a used one for you. and if you don't have an rv store try online rv stores or e-bay as a last resort
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