The Buell X1 Lightning uses a 5008 bulb size for front turn signal applications, while rear turn signal positions accommodate either 5008 or 232 bulb sizes. The replacement chart covers 1999 to 2002 vehicle production 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.
The Buell X1 Lightning uses the 5008 bulb as the dominant turn signal type across its 1999-2002 model years, appearing in both front and rear positions for most of the production run.
The 5008 is an ANSI-standard single-filament bulb rated at 12V, fitted with a BA15s bayonet base, and is a lower-wattage variant of the more common 1156 bulb.
The BA15s bayonet base on the 5008 features a single contact pin, which is a key fitment detail distinguishing it from dual-contact bayonet bases used in other automotive bulb types.
The rear turn signal on the 2001 X1 Lightning takes a 232 bulb rather than the 5008 used in all other model years, making 2001 a notable exception in rear fitment.
The 232 is a festoon-style bulb with an SV8.5 base, rated at 12V and 3W. Its cylindrical form factor and end-cap contacts make it physically incompatible with the BA15s bayonet socket used by the 5008.
Because the 232 and 5008 use entirely different base types, the two bulbs are not interchangeable, and substituting one for the other in the 2001 rear turn signal housing is not possible without socket modification.
The front turn signal position uses the 5008 uniformly across all four model years, 1999-2002, indicating no variation in front fitment throughout the production span covered by these specifications.