Just looked this up and found Husker selling official reman rear axles for around $400. I didn't check the fronts. And the punchline inducing ebay Latvian dealer selling them for sub $300. Not sure if I have the courage to find out if he/she/it is real or if the axles are real or counterfeit.

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David.X5
2001 X5 4.4i Sport
SOLD! at 160k miles