The stock HVAC vacuum hoses have soft plastic fittings on the AC controls end and on the actuator end, but in between they use the GM hard plastic lines. I have seen sections of hard plastic lines sold at the parts store, and I'm sure you can get it from online sources.
In my truck I used short pieces of regular vacuum hose to splice some breaks in the hard lines. They also sell small packs of splices in the Dorman or Help! carded parts section. I considered switching to regular rubber vacuum line, but it is much bigger around and harder to fit back under the dash. The hard plastic lines are thin and smooth so they "snake" very well behind the dash.
Bruce
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