AC Recharge Nozzle?
If you don't get a response here, and can't find it yourself, a simple thing to try (they might not know, but might as well ask) would be to go to one of the various auto parts stores that sell refrigerant recharge kits (Advance Auto Parts, AutoZone, etc), tell them you weren't able to find it in the Haynes book, and see if they can show you where it is.
http://home.howstuffworks.com/ac2.htm
Once you understand the basics it will help you on any system as they all have the same basic parts. Car, house, refridgerator, all the same.
Is it a V6 or LT1? If you find a picture, I can tell if it's the right one or not.



