Vacuum Actuator replacement

[RidingBean]

I am going through the heater/ac box from a 1973 Scamp. My concern is the Vacuum actuators that control the doors. Is there a source to get new versions of these parts? The ones I have seem to be holding vacuum alright at this time, I would rather not have to revisit this work in the next few years just because one of them failed. I am not finding anything with The Googler, and the parts suppliers around me are no help either.

What solutions has anyone else come up with for dealing with these when they fail?

View attachment vacactuators.jpg

 

[RedFish]

I don't think so. Too many variations were produced. They can be renewed. Just a rubber diaphragm inside.