Mercedes-Benz 220 front and rear turn signal bulbs utilize P21W size across both positions. The replacement chart covers 1968 to 1973 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The P21W is the sole bulb type specified for the Mercedes-Benz 220, covering both the front and rear turn signal positions across the 1968-1973 model years.
The P21W is a single-filament bulb, meaning it serves one lighting function per unit rather than combining two functions within a shared housing, as a dual-filament bulb would.
The P21W operates at 12 volts and draws 21 watts, which places it in the standard signalling power range used across a wide range of vehicles produced under ECE regulations.
The BA15s designation refers to a single-contact bayonet base with a 15mm collar. The "s" distinguishes it from the BA15d, which carries two contacts, making the two types non-interchangeable despite sharing the same base width.
The P21W is governed by ECE standards, a regulatory framework applied across Europe and numerous other markets worldwide, establishing uniform performance and dimensional requirements for the bulb type.
Because the same P21W specification applies to both the front and rear turn signal positions on the Mercedes-Benz 220, a single bulb type serves all four turn signal sockets on the vehicle.