Ducati ST4S Tail Light Bulb Size
The Ducati ST4S tail light uses a P21/5W bulb size for optimal rear illumination. Replacement bulb specifications in the chart span 2001 to 2004 production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
Bulb Size by Year Range
| Years | Bulb Size |
|---|---|
| 2001-2004 | P21/5W |
Bulb Specifications
| Description | Bulb Size |
|---|---|
| ECE standard (Europe & worldwide). Dual-filament signalling bulb with BAY15d bayonet base. 12V, 21W/5W. | P21/5W |