Order from rockauto.com - i order alot of parts from here for cars i work on just make sure you get a quality aftermarket brand.

I replaced my furthest front control arms/thrust arms or whatever they are called recently.. 85$ or something close for both shipped. I got the DORMAN brand.

Also lookup rockauto 5% off code itll be in the first few search results.

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2006 X5 4.8is Fully Loaded