All 6h30p tube dampers since I bought my CD7 used in 2011, until I got my Ref 75SE in February this year have been the same, including spares I got directly from ARC in December. All have been a single, "donut-shaped" ring with circular cross section. But they are always mounted in pairs, close together on the 6h30p, so they look like a double ring. I guess it's the same on the Ref 160M.
Are you really sure they've been double rings, not just two stuck together?
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