Unless your springs are broken or your shock absorbers are worn, you shouldn't need to replace either of those (although it might make a difference to your car's handling). The metal parts of the rest of the suspension (anti-roll bars etc) shouldn't need replacing unless they get damaged or corroded. The kind of problen you're talking about sounds like bushes and S60-MBS is probably right that all you need to do is lubricate them and the creaking will stop. As Pete says, if the bushes are worn or cracked, they'll need replacement.
Ed
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