Agreed.The surface of the white piece looks to be broken. That won't allow you to get a good seal for the vacuum if you try to put it back together. Probably time to start searching for a replacement. Might want to check with Mike @Motorcity Mustang.
I went with Classic Auto Air, they rebuild my AC/Heat Control Vacuum Switch back to Ford Factory Spec'sCheck with Vintage Car A/C
Check also with Classic Auto Air
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