The Mercedes-Benz Sprinter front side marker uses a 12961 bulb size, while rear side marker applications utilize either 12821 or 12961 bulb sizes depending on model configuration. The replacement chart covers vehicle production years spanning 2010 to 2025 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 Sprinter front side marker position uses the 12961 bulb size across the 2010-2021 model years, with the 2019-2021 entries specifying this fitment applies to vehicles equipped with halogen headlamps.
The rear side marker position on the 2010-2018 Sprinter also uses the 12961 bulb, making it the same size as the front side marker for those model years.
The 12961 is a Philips part number designating a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W.
The rear side marker position on the 2022-2025 Sprinter uses the 12821 bulb size instead of the 12961.
The 12821 is also a Philips part number designating a T10 miniature wedge bulb with a W2.1x9.5d base, rated at 12V and 5W, sharing the same electrical and physical base specifications as the 12961.
Despite the shared T10 form factor and W2.1x9.5d base between the 12961 and 12821, they carry distinct Philips part numbers, which indicates a difference in construction or light output characteristics not captured by voltage and wattage ratings alone.
The front side marker position on the 2019-2021 Sprinter (Mercedes-Benz Sprinter) carries a halogen headlamp qualifier, meaning vehicles with a different headlamp technology may not share this fitment.