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Subscribed. Unfortunately, I can't help with the answer you want. Here's the answer you don't want: you can buy the whole hose, black ring and all, for a mere $175.38 from PMNA last I looked. The part number is 997.572.795.91. But I assume you're looking for a more reasonable alternative. Were you able to source the aluminum corrugated hose but not the ring? If so, from where?