The Mercedes-Benz 200D uses a 3893 bulb size for front side marker applications, while rear side marker positions accommodate either 12821 or 3893 bulb sizes. The replacement chart covers 1966 through 1973 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.
The Mercedes-Benz 200D uses two distinct bulb types across its side marker positions: the 3893 and the 12821, each with different base types and electrical characteristics.
The 3893 is an ANSI-standardized bulb rated at 12V and features a BAY15d bayonet base with dual filaments, classifying it as a specialty application bulb recognized across the US and Canadian markets.
The 12821 is a Philips part number designation for a miniature wedge-style T10 bulb with a W2.1x9.5d base, rated at 12V and 5W, representing a single-filament low-wattage light source.
The BAY15d base of the 3893 and the W2.1x9.5d wedge base of the 12821 are physically incompatible, meaning the two bulb types are not interchangeable despite both operating at 12V.
The front side marker position on the 200D uses the 3893 bulb uniformly across all listed model years from 1966-1973.
The rear side marker position on the 200D uses the 3893 bulb for the 1966-1967 model years, then transitions to the 12821 bulb for the 1968-1973 model years.
The 1967 200D rear side marker shares the same 3893 bulb as the front side marker, while the 1968 model year marks the point at which the rear position shifts to the 12821 specification.
The dual-filament construction of the 3893 is a notable characteristic, as most side marker applications rely on single-filament bulbs; this places the 3893 in a specialized category relative to the 12821.