Driver's air vent...do I need it?

I say, devise a way that you can re--install it. "Back when" I LOVED these vents. My 64, 69, and 70 RR all had 'em.

One reversible way would be to make a "toggle." bend up a piece of strap, weld a nut in the middle, and make a plate below with a gasket. Just clamp it from the bottom, like an engine block heater