The Mercedes-Benz C36 AMG tail light requires a bulb size of 12821 for the rear lighting assembly. Available data for the specified vehicle covers the range from 1997 to 1997.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mercedes-Benz C36 AMG uses two distinct bulb types across its tail light assembly: the P21/4W for the inner tail light position and the 12821 for the outer tail light position, covering both the 1995-1996 model years.
The P21/4W is a dual-filament bulb rated at 12V with a 21W primary filament and a 4W secondary filament, making it suitable for combined stop and tail light functions within a single unit.
The P21/4W follows the ECE (Economic Commission for Europe) lighting standard, which is the regulatory framework governing vehicle lighting across Europe and numerous other markets worldwide.
The P21/4W uses a BAZ15d bayonet base, which is an offset-pin bayonet fitting. The offset pin placement prevents incorrect installation of the bulb in the wrong orientation, which is critical for a dual-filament design where each filament serves a different function.
The 12821 is a Philips part number designation for a T10 miniature wedge bulb rated at 12V and 5W, used in the outer tail light position of the C36 AMG for both model years covered.
The T10 wedge bulb uses a W2.1x9.5d base, a wedge-style fitting that relies on wire contacts rather than a bayonet or screw mechanism, and is a single-filament design given its single wattage rating of 5W.
The BAZ15d base of the P21/4W is not interchangeable with the W2.1x9.5d wedge base of the 12821, as the two bulbs use fundamentally different socket types and serve different positions within the tail light assembly.
The P21/4W and 12821 also differ in physical size and light output, with the P21/4W producing significantly more light at its primary filament, which corresponds to its role in a higher-visibility signalling function compared to the lower-output 12821.