Rear Seat Conundrum

AlaskaJeff said

Thanks I may take you up on that. Funny my door panels don’t even have the holes punched out.

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I'm no Duster expert but it's very likely rear armrests were not standard. Don't forget, Dusters were considered an economy car back then.
On 67-69 Barracudas, rear armrests were not standard. Only added when deluxe interior was ordered.