The Big Dog Wolf high beam and low beam headlight bulbs both utilize a 9003 bulb size. The replacement chart covers 2010 to 2011 vehicle 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 9003 is a dual-filament halogen bulb operating at 12 volts, with a 60-watt filament for high beam and a 55-watt filament for low beam, mounted on a P43t base.
The ANSI 9003 standard applies to the United States and Canada, meaning the specification follows North American electrical and photometric requirements for halogen headlight bulbs.
The Big Dog Wolf uses the 9003 bulb for both its high beam and low beam headlight positions across the 2010-2011 model years.
Because a single 9003 bulb serves both beam functions through its dual-filament design, one bulb occupies both the high beam and low beam roles in each headlight housing.
The P43t base is a bayonet-style fitting with a 43mm flange, and correct base type matching is a critical factor in physical fitment for the Wolf's headlight socket.
The 9003 and H4 bulb types share the same P43t base and dual-filament configuration, though they originate from different standards bodies, ANSI and ECE respectively, which can affect interchangeability depending on regional compliance requirements.