1970 duster heater hose bracket

If you have a hole saw or the right size drill bit ,one could be easily made. I doubt most people could tell the difference.
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I know that I can make one since I am a retired Tool & Die Maker but I would like to have an original one if possible! Was there a gasket behind it, what kind of material was it and would you happen to know how thick the metal was just incase I do have to make one!