The Buell XB12S Lightning front and rear turn signal bulbs utilize a 232 or 5008 size. The replacement chart covers 2004 through 2009 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 Buell XB12S Lightning uses two bulb types across its front and rear turn signals: the 232 and the 5008, both conforming to ANSI standards applicable in the US and Canada.
The 5008 is a single-filament bulb with a BA15s bayonet base operating at 12V. It is a lower wattage variant of the 1156 bulb, meaning the two share a base type but are not wattage-equivalent replacements for one another.
The 232 is a festoon bulb with an SV8.5 base, rated at 12V and 3W. Festoon bulbs are cylindrical in form and seat by pressing between two spring contacts rather than inserting into a socket, which is a physically distinct mounting method from the BA15s bayonet base used by the 5008.
Because the 232 and 5008 use fundamentally different base types, they are not interchangeable with each other regardless of voltage compatibility.
The front turn signal on the XB12S Lightning used the 5008 for model years 2004-2008, then transitioned to the 232 for the 2009 model year.
The rear turn signal specification for the 2005 model year differs from adjacent years. The 2004 and 2006-2008 rear turn signals specify the 5008, while the 2005 rear turn signal specifies the 232, the same type used in 2009.
In 2009, both the front and rear turn signals on the XB12S Lightning specify the 232, making it the only model year in the provided data where both positions share the same bulb type.