Original Porsche ac parts weren't very good when they were new, don't waste your time with them. Find a complete kit with up to date parts from a well known supplier.
You can look through my old post from 10 years ago when I installed mine, its still going strong.
https://forums.pelicanparts.com/911-930-turbo-super-charging-forum/842475-retroair-complete-system-my-non-c-car.html
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Steve
1981 SC Steel Widebody Outlaw in Pacific Blue and Artic White, 930/51 to 3.2l, K27 7006 Turbo, P&P Twin Plug heads, Twinfire Ignition, BLwur, Ruf Intercooler, Powerhaus headers, Zork, CIS Euro FD, 009 injectors, DOD, DP Lid, 044 pump, 930 4 sp LSD, Mocal 44 w/fan, LM2, Brembo, Retroair, Euromeisters.
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