That sounds like the shock bumpstop. They are a pinlk / orange colour and prevent the shock bottoming out when suddenly compressed. They tend to disintegrate with age - or they did on my car. If yours are still in one piece I would leave them as is.
You have to remove the shock and spring to replace them.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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