You can try a set of the factory 17" wheels and tires. The larger sidewalls on the tires will soften things up. Plus, you can probably find a used set for a reasonable price.
It will be much easier to install new wheels and tires rather than new suspension parts.
Good luck
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2008 X3 | Monaco | Sand/Black | ZAP | ZPP | ZCW | Xenon
BMW CCA #422951
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