The Mercedes-Benz CLK500 front turn signal uses a P21W, 1156NA, or 2357NA bulb size, while the rear turn signal requires either a PY21W or P21W bulb size. The replacement chart covers 2003 to 2006 model years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.