It's the Lower Control Arm - Autodoc has them cheap (get their mobile app for bigger discount and wait for 42-46% off), go for Lemforder.
You can check/cross-reference part number here.
BMW Parts Catalog
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You always replace suspension parts in pairs, so get Left and Right.
They make parts for BMW, you'll see that the M logo is grinded off - they're made in the same factory, but ones sold by 3rd parties can't have the M logo for legal reasons.Thanks. Lemforder just as good as OEM?