Locking gas cap 66 dart

Nope, the inside diameter of the hole is slightly different. I've seen them jammed on there too, and, they ruined the filler neck to where the correct cap won't seal anymore. Usually the limit tabs get bent over against the side of the tube and the cap just spins around 360 degrees.
Thanks, I ending up getting this from eBay. NOS Mopar Locking Gas Cap 4002758 04002758 CHRYSLER DODGE 65-79 PLYMOUTH 66-78 | eBay, his measurements seem to fit.

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