Moto Guzzi California Stone front turn signal bulbs use 5008 or 232 size, while rear turn signal bulbs use 5008 size. The replacement chart covers 2002 to 2005 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 dominant bulb type across the Moto Guzzi California Stone turn signal specifications, appearing in both front and rear positions for the 2002-2003 and 2005 model years.
The 5008 is a single-filament bulb operating at 12 volts with a BA15s bayonet base, classified under ANSI standards applicable in the United States and Canada.
The BA15s bayonet base uses a single contact pin, which is a defining physical characteristic that distinguishes it from dual-pin bayonet variants and makes it non-interchangeable with those types.
The 5008 is a lower wattage variant of the 1156 bulb. Both share the BA15s base, but their differing wattage ratings make them functionally distinct, and substituting one for the other may affect turn signal flash rates or circuit load.
The 2004 front turn signal on the Moto Guzzi California Stone specifies a 232 bulb rather than the 5008 used in all other listed positions and years.
The 232 is a festoon-type bulb with an SV8.5 base, rated at 12 volts and 3 watts. A festoon bulb is cylindrical in form and makes contact at each end rather than through a base socket, making it physically incompatible with the BA15s bayonet socket used by the 5008.
Because the 2004 front turn signal uses a festoon 232 while the 2004 rear turn signal uses the bayonet-base 5008, the front and rear positions in that model year require two different and non-interchangeable bulb types.