Appears prices have dropped. I recall $70 a few years ago when one broke off, so I epoxied a copper stub in there. Like post #5, it will never be hopeless since just a plumbing design. The check valves make it harder, but you can buy those alone, meant for vac boosters.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans