The Vespa GTV 300 high beam and low beam headlight bulbs both utilize a 9003 bulb size. The replacement chart covers vehicle production spanning 2011 to 2017.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Vespa GTV 300 uses the 9003 bulb type for both high beam and low beam headlight positions across the 2011-2017 model years.
The 9003 is an ANSI-standard designation recognized in the United States and Canada, making it a North American market specification rather than a universal international one.
The 9003 is a dual-filament halogen bulb, meaning a single bulb unit contains two separate filaments to serve both the high beam and low beam functions within one housing.
The bulb operates on a 12-volt electrical system and carries a wattage rating of 60W for the high beam filament and 55W for the low beam filament.
The 9003 uses a P43t base, which is a bayonet-style mount with a 43mm flange. This base type determines physical fitment and is not interchangeable with other base configurations such as H4 screw-type variants, despite the 9003 and H4 sharing similar electrical characteristics.
Because both the high beam and low beam positions share the same 9003 specification across all listed years, a single bulb type serves the entire headlight assembly on the GTV 300.