When I bought my '68, it had cheep plastic side view mirrors on both sides. Not only did they look wrong, but the wing windows couldn't be opened without nocking the mirrors out of whack. The passenger side mirror was not convex and didn't provide much of a view of anything more than the headlight of the car in the blind spot. (Or more often, the sky)
This convex mirror from WCCC is an exact "mirror image" of the driver side mirror (which I also replaced) The convex mirror provides a good view of what is on the side and rear of the car.
I watched the installation video and with the proper parts and tools, the process was just that easy. Adjustment was a little tricky, but after installing the driver side mirror, the passenger side went much quicker. Finally, my Cougar looks proper.