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I had a similar noise, replaced the track arms with the ones from Vertex. They were a pain to install due to the urethane being so stiff and making that conform to the suspension geometry. I ended up having to load the rear suspension to get things lined up for reassembly.
Another important point: the Vertex rebuilt arms are too large at the body mounting point. The diameter of the washer/grommet that captures the urethane is to large and does not fit in the allocated space on my 2000 986 S. I had to grind a section of the washer away to make it slide into the opening and get the bolt through, this is kind of a bummer as it seems like a major oversight from Vertex. Just an FYI for anyone planning the Vertex track arm replacement...
Most importantly, the rattling/clunking noises from the rear suspension are gone, now other squeaks and rattles are more noticeable. :-P
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