Take a look at my post below of when I disassembled that area of my '73T - they may help. I have some more photos showing the ventilation system disassembly that I can post here if you would like.
https://forums.pelicanparts.com/porsche-911-technical-forum/874800-saving-another-73-a-2.html#post8715802
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'73 911T RoW (Project)
'77 911S 2.7RS
'76 914 2.0
Early911SReg #2945
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