armrests and shoulder belts optinal on a 70 Duster?

Hi gang.

I've been working on my 70 DUster for about 2 months now. Just noticed yesterday that there are no rear seat armrests. Were armrests an option in 1970? My Duster is a zero option plain jane car, absolutely no options at all. Maybe getting armrests was possible but cost extra??? Front seats have armrests but no ash trays in them.

Strange thing is it has shoulder belts for the front seat. Maybe these were required as a standard feature in 70 Dusters for California?

Thanks for any info.

The Big E