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AC hoses are available at Ecklers, corvette america, all the big suppliers. Compressors are availablt at most parts places. You will need a new drier also. If your concidering going to R134A the system will need to be flushed to get all the old oil out and a new paralell flow condensor will be a good idea.
Just as a side note, I would stay away from Ecklers, particularly when dealing with a/c parts. I ordered a hose from them last year which turned out to be wrong and then they tried to pass of an evaporator as a new Delco part when after research it turned out to be a reman. unit. I finally got the hose from Corvette Central. Frankly, I think Ecklers has gone to pot over the past few years. Expensive and low quality in general.