Vacuum line for air mode the nipples broke off the box behind the dash?

Hello, do you have the two broken off pieces? Thats a tough fix due to its location, but I would try a 2 part epoxy. You'll see it in glue section of walmart for example. It mixes the two chemicals together as its being pushed out, then mix it up and apply it just on the outer edges of that break. Most epoxies will set up in a few minutes to hold, then let it dry for 24hours.
Or you can go to your local used auto parts yard and get a used one. If you use epoxy be sure not to get any in the vacuum line holes obviously, but it will only take a little bit if you get a good brand. I use the JB weld type, it seems to be the strongest and lasts.