1966 Barracuda A/C question

Sounds like you mean the factory AC/heater box, plus the thin under-dash vents (like my 69 Dart had). I was considering a full used set for $100 on ebay, but since my 65 Dart wasn't factory air I would have had to cut new holes in the firewall. I ended up going with an under-dash unit. You can find those new on ebay for ~$110.