1968-1974 Right Hand mirrors were never factory installed. In 1973, right and mirrors were offered as a dealer installed accessory.
We refer to 1968-1979 Chrome mirrors as Small Head and Large Head.
Glass in 1968-1974 mirrors measures 5" across (Small Head)
Glass in 1975-1979 mirrors measures 6" across (Large Head)
Chrome outside mirrors (large head) were used on 1977-1979 without the RPO D35 Sport Mirror option.