Ducati Monster 821 License Plate Bulb Size

The Ducati Monster 821 license plate bulb uses a DE3423 size. The replacement chart covers 2015 to 2017 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.

Bulb Size by Year Range

Years	Bulb Size
2015-2017	DE3423

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Festoon bulb, 41mm length, end-cap contacts. 12V.	DE3423

Other Locations

Additional Notes

The DE3423 is the license plate bulb size specified for the Ducati Monster 821 across the 2015-2017 model years.
The DE3423 follows the ANSI standard, which governs bulb specifications for the United States and Canada markets.
This bulb belongs to the festoon category, a cylindrical form factor that seats between two end-cap contacts rather than using a bayonet or wedge base.
The DE3423 has a length of 41mm, which is a defining fitment factor for festoon bulbs, as incorrect length prevents proper contact with the housing terminals.
The bulb operates at 12 volts, consistent with standard automotive electrical systems.
Because festoon bulbs rely on end-cap tension for electrical contact, substituting a festoon of a different length risks poor contact or failure to seat within the license plate housing.