Fresh Air Vent Box

I've got a '66 Barracuda & the door broke off of the driver's side air vent box (below the dash, just above the dimmer switch) a few years ago. I decided to fix it this winter only to discover that I've lost the door! I bought a vent box on E-bay only to discover that it is a different style (it attaches at the top). The one I need has 2 long rods that run from the bottom to the top to hold the box in place. It is removed by loosening these 2 rods from the bottom of the box. The one I got on E-Bay won't work at all. Does anyone have one of these boxes (or just the door)that they can spare? Does anyone know what boxes fit the '66 Barracuda? I'm guessing the '66 Valiant does.........anything else?