CVJ Axles in Denver area sells quality rebuilt axles. I have used them several times with good outcomes. I think they may only rebuild genuine BMW axles.

https://www.cvjreman.com/

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'03 530i - manual swapped - 425k miles
'06 325Cic auto 115k
'05 X5 3.0 auto 158k
'99 E39 528i 5-speed 130k