This is a Genuine Rear Left Door Outside B Pillar Cover Shadow Line.
This item is New, see photo.
OEM Part number: 51357416531 ;
Fits:
BMW X4 G02 (03/2017–07/2021)
BMW X4 G02 LCI (08/2020–03/2025)
BMW X4 M F98 (06/2017–07/2021)
BMW X4 M F98 LCI (08/2020–03/2025)