I want to get replacement vacuum port fittings or intake manifold fittings, where would I find them? I'm talking about the metal cylinders that the vacuum hoses go on. I've searched online for "throttle body port" "vacuum port" etc and not getting any hits. I'd like to find both the press in fittings as well as the screw in kind. What's the proper name and where can I buy?

Hose barb.

Most hardware stores will have brass ones that thread in. The press fit ones are not commonly available, just tap the current hole for a threaded version.

Hose barb has the christmas tree fitting on the end. Looking for the ones like the factory ones with a tube and a flanged end.

Vac Ports ON TB TBI and carbs are Part of them and not available any other way.

Other vac ports on other thing are often same.

Vac ports that are "screwed into" intake man are mostly NPT fitting can find at many places, mostly at junk yards.
NPT is US National Pipe Threads.

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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave

Found what I was looking for...

https://speed-engineering.c...ore-ls1-ls3-lsx.html