You must be talking about the evaporator and blower housing under the hood, that is what FAA Benny will restore for you. I sent mine to Original Air because I was buying the other stuff under the hood from them. If I had to do it again, I would send that piece to FAA Benny or do it myself. Here is my thread where I show pictures and share my experience.
https://67-72chevytrucks.com/vboard/...d.php?t=790246
Bottom line is the evaporator housing can be taken apart and restored, remove a few rivets, clean and patch things up, and use screws to put it back together.