Cortina Mk2 Demister Vents

[Aus911]

Hi all,
While working on my car I found that the front demister vents have fallen apart, see pics.



I was wondering if anyone else has experienced this.
What are they called?
Can you get replacements?
I was considering using a 3d printer to make them, has anyone one already done this?
If yes would you be prepared to share the 3d model so I can print some?

thanks in advance
Ray