Mercedes-Benz 300SD Side Marker Bulb Size

The Mercedes-Benz 300SD front side marker bulb size measures 1034 or P21/5W, while the rear side marker bulb size measures P21/4W, 3893, or 12821. The replacement chart contains bulb size specifications across 1978 to 1993 vehicle production years.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Front Side Marker

YearsBulb Size
1992-19931034
1978-1985P21/5W

Rear Side Marker

YearsBulb Size
1992-1993P21/4W
1981-19853893
1978-198012821

Bulb Specifications

Description Bulb Size
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. Variant of 1157. 12V, 21/5W.1034
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W.P21/5W
ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAZ15d bayonet base. 12V, 21W/4W.P21/4W
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base, specialty application. 12V.3893
Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W.12821

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