Fresh air Vent under cowl

[1970 CST]

I've been searching for information on the A/C-Fresh air venting for my 70 C10. I think I have it all figured out as to how it works but now I have an issue with my original vent. As you can see in the picture the pivot has broken off. I believe I could JB weld it and it will hold but also the rubber seal is dried out and breaking off. I searched some of the vendors but I couldn't fing a source for the vent or the rubber seal. I would like to keep the system as it was originally designed. Any suggestions would be appreciated.
Terry