The Moto Guzzi Eldorado uses an H3 bulb size for high beam and H7 bulb size for low beam headlight applications. The replacement chart covers 2015 through 2018 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 Moto Guzzi Eldorado uses the H3 bulb for high beam across the 2015-2018 model years and the H7 for low beam across the same span, making these two bulb types the sole headlight fitments specified for this model.
Both the H3 and H7 are single-filament halogen bulbs operating at 12V and 55W, meaning each bulb handles only one lighting function rather than combining high and low beam in a single unit.
The H3 uses a PK22s base, while the H7 uses a PX26d base. These two base types are physically incompatible with each other, so the high beam and low beam positions do not accept the same bulb.
Both bulb types are governed by ECE standards, which are the regulatory norms applied across Europe and much of the world, and both also carry approval for use in the United States and Japan.
Because the H3 and H7 share identical voltage and wattage ratings, the distinction between them lies in base configuration rather than electrical load, which affects socket fitment rather than the vehicle's electrical system.
The PK22s base of the H3 is a pinch-type connector, whereas the PX26d base of the H7 is a bayonet-style connector with two offset pins. Substituting one for the other is not physically possible without modification.