The Ford Aspire uses the 9003 bulb size for both high beam and low beam headlights across all model years from 1994-1997.
The 9003 is a dual-filament halogen bulb, meaning a single bulb contains two separate filaments to serve both the high beam and low beam functions within one unit.
The 9003 operates at 12 volts and carries a wattage rating of 60W on the high beam filament and 55W on the low beam filament.
The 9003 uses a P43t base, which is a bayonet-style mount with a 43mm flange width, and this base type determines physical fitment into the headlight housing.
The 9003 is an ANSI-standardized bulb recognized in both the United States and Canada, meaning it conforms to a defined set of performance and construction standards shared across manufacturers.
The 9003 and H4 bulb types share the same dual-filament halogen design and P43t base, though the 9003 designation follows North American ANSI standards while H4 follows ECE standards used in other markets. These two types are often considered interchangeable in practice, though the applicable standard for the Ford Aspire is the ANSI 9003.