This part is listed by BMW as BMW part number 27107535718 (27-10-7-535-718) and is described as Genuine BMW Input Shaft Seal for Transfer Case on E46 325xi, 330xi (2001, 2002, 2003) and E53 X5 3.0i, 4.4i (1999, 2000, 2001, 2002, 2003).
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BMW Fitments:
3 Series
E46 (99-05) > 325xi
E46 (99-05) > 330xi
X5 Series
E53 X5 (00-06) > X5 3.0i M54
E53 X5 (00-06) > X5 4.4i M62 (99-03)