the Heater Delete option?

As promised, here are some pictures of my right-side 'heater delete' vent box. Don't mean to side-track this from the OP question but it's sort of relevant.

I have the little door handle, just forgot to show it in these pics. The foam rubber seal gasket is wasted.
IMG_6654.jpg

The seller sent me everything including the hangers. When it arrived at my door, the door was still attached but just barely. The second I opened it, it fell off. Probably hadn't been moved in decades.
IMG_6643.jpg

Back side.
IMG_6644.jpg

Side view. I'm not sure what the angled cutout is for but if I had to guess it would be a steering column bracket or something. I'm not sure if the '68 Hemi Darts or 'Cudas had these reliefs, might be unique to the Australian cars.
IMG_6646.jpg

Outer side. The part number is stamped on both sides.
IMG_6648.jpg

Bottom side with the brass rivets. The shape is actually kind of complex.
IMG_6645.jpg

Part number and 'old' Mopar logo. Cool!
IMG_6650.jpg