Aftermarket A/C

[Puzzigully]

Did all this come as a kit ? Who was it purchased through ?

No, but you can purchase as a "kit", but you still dont get everything illustrated.
I also need to get demister vents yet as well.

There's many distributors of Vintage Air in Australia, but only one who i know does the blanking plate.
Retrospares in Eltham Victoria sell the Vintage Air and blanking plate
https://www.retrospares.com.au

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It's being installed in this:
Attachment 16693