Flow Through Vent System

Hello everybody,a couple words of introduction first, its a 66 289 with a four speed.
It belongs to a good friend,im going to be getting in deep with his resto.
Im a mechanic, hes a bodyman.
I see 12 vents in the trunk filler panel, aparrently a factory or dealer option.

Does anybody have a working flow through vent system, so we can determine whats missing and get it operational?

We can manage everything else,but all my searches have amounted to much of nothing.
Not even one photo. Which i will remedy shortly.
Thanks in advance for your help.
frank
 
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