The Kawasaki ZX550 GPZ headlight bulb uses a 9003 size for both high beam and low beam functions. The replacement chart covers 1984 to 1985 production 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. It uses a P43t base and conforms to the ANSI standard applicable in the United States and Canada.
The Kawasaki ZX550 GPZ uses the 9003 bulb for both the high beam and low beam headlight positions across the 1984-1985 model years.
Because a single 9003 bulb serves both beam functions through its dual-filament design, the high beam and low beam headlight positions share the same bulb type rather than requiring separate components.
The P43t base is a bayonet-style fitting with a 43mm collar, and correct base alignment is a factor in fitment, as bulbs with differing base types are not interchangeable even when electrical ratings are otherwise similar.
The ANSI designation of the 9003 indicates it meets a standardized specification used in North American markets, which is distinct from the ECE-regulated H4 bulb used in other regions, despite the two types sharing closely related physical and electrical characteristics.