Mercedes-Benz CLK550 Turn Signal Bulb Size
The Mercedes-Benz CLK550 front inner turn signal requires 1034NA or 1157NA bulbs, the front outer turn signal uses 12961 bulbs, the front turn signal uses P21W bulbs, and the rear turn signal requires 12496 or PY21W bulbs in these specific sizes. The replacement chart covers 2007 to 2009 model 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.
Front Inner Turn Signal
| Years | Bulb Size |
|---|---|
| 2009 | 1034NA |
| 2007-2008 | 1157NA |
Front Outer Turn Signal
| Years | Bulb Size |
|---|---|
| 2007-2009 | 12961 |
Front Turn Signal
| Years | Bulb Size |
|---|---|
| 2007-2009 | P21W |
Rear Turn Signal
| Years | Bulb Size |
|---|---|
| 2008-2009 | 12496 |
| 2007 | PY21W |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base, natural amber glass. Variant of 1157. 12V, 21/5W. | 1034NA |
| ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base, natural amber glass. 12V, 21W/5W. | 1157NA |
| Philips part number. Miniature wedge bulb (T10) with W2.1x9.5d base. 12V, 5W. | 12961 |
| ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W. | P21W |
| Philips/Osram part number. Halogen bulb, specialty application. 12V. | 12496 |
| ECE standard (Europe & worldwide). Single-filament amber bulb with BAU15s bayonet base. 12V, 21W. | PY21W |