The Buell XB9SX Lightning front turn signal bulb size measures 232 or 5008, while the rear turn signal bulb size measures 5008. The replacement chart covers 2005 through 2009 vehicle 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 5008 is the most frequently specified bulb across the Buell XB9SX Lightning turn signal data, appearing in the rear turn signal position for all five model years covered and in the front turn signal position for 2005-2008.
The 5008 is an ANSI-standard single-filament bulb rated at 12 volts, fitted with a BA15s bayonet base, and is classified as a lower wattage variant of the 1156 bulb 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 without a socket modification.
The 2009 Buell XB9SX Lightning front turn signal departs from the 5008 specification used in prior years, instead calling for the 232 bulb type.
The 232 is an ANSI-standard festoon bulb rated at 12 volts and 3 watts, fitted with an SV8.5 base, which is a cylindrical form factor held in place by spring-loaded end caps rather than a twist or bayonet socket.
The physical mounting style of the 232 festoon bulb is fundamentally different from the BA15s bayonet base of the 5008, making the two types incompatible with each other's sockets.
The rear turn signal specification for the 2009 model year remains the 5008, meaning the front and rear positions on that year's motorcycle require two distinct bulb types.