Ducati ST2 front turn signal bulbs utilize 5008 and 232 sizes, while rear turn signal bulbs use 5008 size specifications. The replacement chart covers 1997 to 2003 production years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 5008 is the dominant bulb type across the Ducati ST2 turn signal specifications, appearing in both front and rear positions for the 1997-2003 model years, with a single exception in the front turn signal position for 2002.
The 5008 is an ANSI-standard single-filament bulb operating at 12 volts, fitted with a BA15s bayonet base. It is a lower wattage variant of the 1156 bulb, which shares the same BA15s base type.
The BA15s bayonet base on the 5008 is a single-contact design, meaning it is not interchangeable with dual-contact bayonet bulbs such as the BA15d, despite a similar physical appearance.
The 2002 Ducati ST2 front turn signal takes a 232 bulb rather than the 5008 used in all other model years and positions. This makes the 2002 front position a notable exception within the ST2 lineup.
The 232 is a festoon-type bulb with an SV8.5 base, rated at 12 volts and 3 watts. Its cylindrical form factor and end-cap contacts differ fundamentally from the bayonet base of the 5008, making the two bulb types physically incompatible with each other.
Because the 2002 front turn signal uses a festoon 232 bulb while the 2002 rear turn signal uses the bayonet-base 5008, the front and rear positions on the 2002 model require different bulb types and are not interchangeable.
Both the 5008 and the 232 conform to ANSI standards applicable in the United States and Canada, indicating standardized ratings and base specifications within those markets.