The Mercedes-Benz E420 front side marker bulb uses a 12961 size with P21/5W designation, while the rear side marker bulb utilizes 12821, 232, or 5008 sizes. The replacement chart covers 1994 to 1997 model production 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.