Vent box hinge - 1966 Plymouth Valiant

Thanks for the reminder pic. I forgot how the hinge was configured.
I do wish someone would create a replacement cover with a screened and griled vent to put there. I'm imagining a round grille with louvers all directing one way and assembly can be rotated to direct the air where desired. Variable open close, screen to catch debis.
I'm sure Leanna would be happy to powder coat a few thousand of these.
At the rate my current projects are progressing I wont live long enough to get on this one.