Mercedes-Benz 250 front and rear side marker bulbs utilize a 3893 bulb size for both locations. The replacement chart covers vehicle production spanning 1968 to 1973.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mercedes-Benz 250 uses the 3893 bulb for both front and rear side marker positions across the 1968-1973 model years.
The 3893 is classified under the ANSI standard, meaning it conforms to the standardized bulb specifications recognized in the United States and Canada.
This bulb operates on a 12-volt electrical system, consistent with the standard automotive voltage found in passenger vehicles of this era.
The 3893 is a dual-filament bulb, meaning it contains two separate filaments within a single envelope, allowing it to serve more than one lighting function.
It uses a BAY15d bayonet base, which is an offset-pin bayonet mount. The two pins on a BAY15d base are positioned at different heights, preventing incorrect installation of a single-filament bulb in place of a dual-filament one.
The 3893 is designated as a specialty application bulb, indicating it is not among the most widely distributed automotive bulb types and may have more limited retail availability than common replacements.
Because the same bulb size applies to all six model years and to both the front and rear side marker positions, a single bulb type services all side marker locations on the Mercedes-Benz 250 throughout its listed production span.
The BAY15d base is not interchangeable with the BA15s or BA15d bases, as those differ in pin configuration and alignment, making cross-substitution incompatible without a socket adapter.