Sometime ago I posted about an annoying vibration in the front end of my x.
It turns out after all that diagnosis and new parts (engine mounts,transmission mounts,vacuum leak test, complete tuneup,etc.) it was the front drive shafts.
I replaced both l&r with GKLodro, the company that manufactures BMW. About 500 for the set. BMW cost 1400 a pair. X drivers great, but there is still a minor vibe, very slight. I was told the specs for BMW drive shafts are so precise that if you use aftermarket you will not have the OEM fit. Thus a continued minor vibe.
Is this true? BTW, also replaced lower control arms and thrust bushings.

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X5 3.0 AUTO -2001 - 238,000 miles