1967 Bench seat headrests ??

Mattax said

Obviously I don't think its simple.
Knowing Clair, he'ld be aware of the difference between an original '67 seat and a '68 or '69.
Archival evidence is good, but when there is archaeological evidence that appears to call it into question, its worth examining further. A reasonable possibility is that at the time of publication bench seat headrests were not available. At some point subsequent that may have changed. When Clair checks in he can fill in what he knows about the car.

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It’s simple history. In 1969, headrests became mandatory starting on Jan 1 1969. Mopar and all other manufacturers were gearing up for it and offered them as options on bench seats starting in late 1968 for 1969 models. Even my 1969 Dart GTS with bucket seats built in October of 1968 didn’t have them standard (but they were optional).

Bucket seats were a high trim option so they were offered for them a year earlier as a option starting in 1967. Back then, the Federal safety mandates were uncertain as to when they going into effect but no manufacturer wanted to be caught unprepared. So they developed them and offered them first on high option trim models to recoup the development costs before they were forced to put them on every seat.