Usually, you can tell from the pictures on the ECS website. The OE part looks to have the AB Electronik logo. Like most of these OE parts from the OEM supplier, the BMW logo is ground off.
Good timing! I need to replace mine too.
For reference, some parts are listed as “front” and “rear” sensors. Can I assume that the “front” one indicates the sensor mounted to the front passenger control arm?
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