The SHW cross-drilled lightweight brake rotor for 2015–2018 BMW M3 3.0L (left rear) is a model-specific replacement listed for that engine and wheel-side. This drilled, lighter-profile rotor is supplied as the left-rear service part with the catalog reference to assist installers in confirming correct fitment and completing a direct replacement on the applicable M3 vehicles.
SHW 15-18 BMW M3 3.0L Left Rear Cross-Drilled Lightweight Brake Rotor (34212284811)