I don't recall if they're out where you are but here in Southern Cal Pep Boys carries the black plastic vacuum line. Mr. Cook's suggestion works also which is what some mechanic did on my '78 Fairmont 2dr sedan. The problem was this "mechanic" didn't bother to install the check valve and didn't check to see if the line to the vacuum ball held vacuum. I kept losing my power vent air (diverted to defrost) every time I accelerated. It was rather annoying and the car idled so much better once I had fixed the vacuum line and lack of check valve by stealing the parts from my '82 Cougar wagon (I'll get the Cougar straighten out when I get to that point in its resurrection).
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