1967 Barracuda windshield wiper knob?

MICHAEL J KLOCK said
This is what is in there now.View attachment 1715064982

That is the correct shape/look knob. If you cant find a prettier one with the set screw, maybe buy a dirt cheap example just for the tensioner that goes in the one you have.
Question... What a/c unit included those single, close to the door vents?