This part is listed by BMW as BMW part number 51218243615 (51-21-8-243-615) and is described as Genuine BMW Exterior Door Handle Carrier, Front Left, for E53 X5 models (2000-2006).
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BMW Fitments:
X5 Series
E53 X5 (00-06) > X5 3.0i M54
E53 X5 (00-06) > X5 4.4i M62 (99-03)
E53 X5 (00-06) > X5 4.4i N62 (04-06)
E53 X5 (00-06) > X5 4.6is M62
E53 X5 (00-06) > X5 4.8is N62