Printed elements of air conditioning/ventilation systems.

Okay, the longer one is E9, the shorter one is E24/E21. What about the third one in the photo?
It's in 2800 from the USA.
It's different from the others.
 

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Regarding bases? Which one is E9 again?

The one with the extra window is for the E9, the shorter one for the E24/E21.
The third one in the photo below is installed in a Nevada 2800 imported from the USA.
The front is completely different.
 

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It is exact match to that in my '75 Euro CS.

It appears that the E9 model had two different evaporator bases.
Perhaps these differences exist in the construction of the evaporator base in pre- and post-facelift models.
In any case, the original A/C evaporator base is difficult to replicate.
Every craftsman I spoke with about this said it was certainly possible, but it wouldn't be cheap due to the shape, which requires more precision and time to replicate.
I think the best solution would be to redesign the base to standardize and simplify its construction while maintaining its functionality.
I see what you mean. Could the first one be e3 as the console is very different?

I think the longer ones with a window are only for E9.

I'll keep you updated on progress.
 
looking forward to hearing of your development on this ... of course then there is the decision of where / how to put in other vents. one approach is to connect them to the defroster vents. another is to do something in the panel under the steering column ... the passenger side is a little more difficult - perhaps under the glove box. i am curious how a flexible duct will work around the passenger glovebox supports

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Why not route the air up to and out of the speaker grille? I personally like fresh air blowing at me when driving
 
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