The Vespa ET4 front and rear turn signal bulbs utilize a 5008 or 232 size bulb specification. The replacement chart covers vehicle production spanning 2001 to 2005.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The two bulb types specified for the Vespa ET4 turn signals are the 5008 and the 232, both conforming to ANSI standards recognized 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 widely known 1156 bulb.
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 end contacts rather than inserting into a socket.
The BA15s bayonet base of the 5008 uses a single locating pin, which distinguishes it from the dual-pin BA15d base. Substituting a dual-pin base bulb into a single-pin socket is not compatible.
The 5008 and 232 are not interchangeable with each other, as they use entirely different base types and physical forms.
For the front turn signal on the Vespa ET4, the 5008 is specified for 2001, 2002, and 2005, while the 232 is specified for 2003-2004.
For the rear turn signal, the 5008 is specified for 2002, 2003, and 2005, while the 232 is specified for 2001 and 2004.
The front and rear turn signals do not share the same bulb type across all years, meaning the correct year must be referenced separately for each position before a replacement is selected.
In 2005, both the front and rear turn signals on the ET4 use the 5008, making it the sole bulb type required for turn signal replacement that year.
In 2004, both the front and rear turn signals use the 232, similarly requiring only one bulb type for that model year.