I think he is referring to the flap that covers the opening where the knob from the outer door pokes through.
If that is the case, on your vintage the original was a hinged door. it folded in and clipped in place with a door latch spring wheel like on a cabinet. The catch worked to hold it open and closed. I have no pictures, but if someone can post one it will make sense.
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Brett G
WBCCI #5501 AIR # 49
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1978 Argosy 28 foot Motorhome
Wise men talk because they have something to say; fools, because they have to say something. -- Plato
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