The Mercedes-Benz E55 AMG uses a 12961 bulb size for the front side marker and a 12821 bulb size for the rear side marker. The replacement chart covers vehicle production years spanning 1999 to 2006 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.
The Mercedes-Benz E55 AMG uses the 12961 bulb for the front side marker position across the 1999-2006 model years.
The rear side marker position on the E55 AMG uses the 12821 bulb, covering the 1999-2003 model years.
Both the 12961 and 12821 are Philips part numbers assigned to miniature wedge bulbs of the T10 type, operating at 12 volts and rated at 5 watts.
The T10 designation refers to a tubular bulb form with a nominal width of 10 thirty-seconds of an inch, a standard sizing convention in miniature automotive lighting.
Both bulbs share the W2.1x9.5d base type, which is the standardized wedge base used across a wide range of low-wattage automotive marker and interior lighting applications.
Because the 12961 and 12821 share identical electrical ratings, base type, and bulb form, they are physically interchangeable in terms of fitment, though they carry distinct Philips part numbers assigned to specific vehicle positions.