Correct, both of my Pintos have factory passenger side mirrors and they are rectangular, and interestingly enough neither chrome piece is notched. Mine are both 1980 models so that may be why. On my S/D the passenger mirror is larger than the drivers, and my Hatchback they are the same size. I can 100% guarantee both are factory installed as the build tag so states.
The S/D has a lot of differences though and is a "truck" according to the sticker on the door, so maybe why the bigger mirror.