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If you are looking for the original part number for your gas cap, it is 2643998.
Here is a link to an online parts catalog for 1966 cars:
https://www.mymopar.com/downloads/partscatalogs/66_Mopar_Parts_Catalog.zip
See page 14-17, section 14-86-0 Fuel tank, part identifier 14-86-35 Cap, Filler...