This part is listed by BMW as BMW part number 51438223171 (51-43-8-223-171) and is described as A Pillar Column Cover, Black - Left - E46 Convertible including 323Ci, 325Ci, and E46 M3.
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BMW Fitments:
3 Series
E46 (99-05) > 323Ci
E46 (99-05) > 325Ci
E46 (99-05) > 330Ci
E46 (99-05) > M3