1967 Barracuda Fast back Mirrors

The 2 previous posts are right .
The passenger mirror was an option. the drivers side was standard equipment.
You should be able to find one from most mopar vendors ( Year one , classic industries)
companies like that or salvage yards and on this site. Check out the for sale section.

Good luck and welcome aboard! I noticed you have one post.
Go to the welcome wagon section and introduce yourself.
There's a good group of folks here willing to help.