Passenger side door mirror 73' Dart Custom?

Considerations... A new bright chrome mirror on one side could look worse than no right mirror. Depends on what the left mirror and rest of the car looks like.
A used OEM right mirror should look more original but those are very rare.
Agree. They do come up on here maybe a couple times a year. I got one off ebay after months of watching and then had to find new glass it was missing. But, as Redfish said, I did not want to have that one super shiny, obviously added new mirror.