You did not state the model year.
But let's say 2006 M54, then PN is 26103402134.

Dicontinued by BMW but you can look around to see if you get lucky and find a brand-new BME DS.
Or check LKQonline for a low-mileage DS (of course make sure the u-joint is good first), which is better than many of these Chinese junks...

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1998 E39 528i 5sp MT
2006 E53 X5 3.0 6sp MT