To add to Flavor's comment, the knocking could be worn drop links, sway bar bushes, upper shock mounts & bearings, rear control arm bushes or coffin arm bushes as well as the shocks themselves.
To replace just the bushes in your existing suspension arms is very difficult without a suitable press. Its a lot easier to replace the individual suspension arms themselves....
Check out Design911UK view the online version for the specials being run at the moment......
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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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