There was a dealer-installed accessory passenger side mirror, and is shown in the 1967 Custom Feature Optional Accessories brochure that covered various Chevrolet models. That brochure has a date of 1966 and probably came out at the beginning of the 1967 new model year. I suspect early on you could also buy the mirror over the counter and install yourself. That same mirror was used on earlier Novas, Chevelles, and probably Corvairs. The assembly plants did not install any passenger side door mirrors on 67 Camaros.