The BMW 320i brake light uses H21W and P21W bulb sizes for the lighting components. Data for the specific bulb requirements covers the time periods from 1977 to 1983 and 2013 to 2018.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
Brake
If US Type and EU Type show the same value, a direct cross-reference for this bulb is not available or the data is insufficient.