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At this point, if it had been on a car with headers for a long time and was left dry, it could be worn past the point of being serviceable. Won't know until you open it up. Replacement couplers are around $100, I believe.
Mine was still tight, greased and looking good so I just bought a new rubber gasket, cleaned it, re-greased it and put it back on. I see no sense in replacing them unless they are pretty worn (pretty simple and durable design).