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from your heading, i thought you were talking about old TV's -
what year corvette are you talking about? most of the hard plastic tubing is not available as OEM parts from dealers. you can get hard plastic tubing, rubber vacuum tubing and miscellaneous pieces/parts from autozone, advanced auto, pep boys, etc, and you'll have to hand fabricate what you need. for the diagram, there should be an emissions decal under the hood, or try a FSM.
if you are talking about old TV's, try antique radio/TV repair shops -
hes talking about an l98 car, all the hard plastic lines that sit under the plenum. when we changed the injectors over the weekend, they all snapped as soon as they were touched!