Truthfully, the only rubber courtesy gaskets I have seen were made as "reproductions" in the post C1 era. Thin rubber by Corvettes suppliers, and thick rubber by 55-57 Chevy suppliers.
The part number remained the same 58-62 and is the same one in my 1938-1963 P&A catalog.
So am I wrong? Were there 2 different kinds or has the good book been fooled by a repro part?

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