The SHW cross-drilled lightweight brake rotor for 2006–2008 BMW Z4 3.2L (left rear) is a model-and-engine-specific replacement listed for that wheel-side. It provides a drilled, lighter-profile rotor supplied as the left-rear service part with the catalog reference so installers can confirm correct fitment for the specified Z4 application before performing replacement.
SHW 06-08 BMW Z4 3.2L Left Rear Cross-Drilled Lightweight Brake Rotor (34212282303)