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I'd just get one from Mark, there's so much confusion from non-928 vendors about what fits what year with which clutch and which pulley. Google '928 porsche 6E171 compressor"' and look at what years various parts places quote as needing a 6E171. Most of them get it wrong.
If your 6E171 is not totally busted up, you could try rebuilding it yourself. The one I did many years ago on an '86 still works today. Seals cost ~$30 at most.
Is there a way to test the clutch and or compressor? The compressor belt was off when I bought my 79 and PO had no history for the short time he had it. I have since pulled the compressor and have it in the garage. I also got a spare part box with the car that has another compressor that I also have no history on other than it is much cleaner than the one on the car.
There is no 'rubber part' of the clutch. There is a friction surface that gets pulled into a flat metal face by the magnetic coil. Usually, if you see something that looks like rubber, it's melted insulaton from the clutch coil itself.
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