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I too had been looking for months for a clutch type sure-grip. I just purchased a clutch type sure-grip from Doctor Diff and parts arrived today. I contacted him for several weeks and he kept telling me he was out of stock. He told me that he is waiting on the housings to arrive from his supplier. I then asked him if he had any used housings that he could rebuild with all new internals. The answer was yes. I bought a "used unit" with all new internals and it has a 6 month warranty. The sure-grip looks brand new. I can't tell a difference. I'm not sure he if has any more available or not.