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Ryc sells one on Amazon but not really worth it unless you could do it on the car and save the labor of removing the compressor itself.
i just did the compressor on my Z using a new Ac Delco unit from Rock Auto, sub $200 difference to do the whole thing. I figure its worth that over the potential of having to take it out again and redoing it later.
The Compressor Clutch isn't considered a field-replaceable item. You have to remove the compressor from the car to even work on it so are have already invested the labor dollars for a large part of a compressor replacement and the choice is to spend money for a replacement compressor or a replacement clutch plus the labor dollars required to replace the clutch. From a dollar standpoint, it is probably cheaper to replace the compressor VS worry about other problems that might be encountered by only changing the clutch.
A long time ago A/C clutch replacement was normal and easy and not too expensive. Plus in most cases you did not have to remove the compressor thus you did not have to pull a vacuum and recharge the system.
Boy, how times have changed and not for the better.
Today too much of replace the complete assembly, either by design or lack of knowledge by the tech.