Suzuki Motorcycle GS450 uses a 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers 1982 to 1983 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 9003 bulb is an ANSI-standard halogen type used in both the United States and Canada. It operates on 12 volts and carries a dual-filament design rated at 60 watts for high beam and 55 watts for low beam, mounted on a P43t base.
The Suzuki Motorcycle GS450 uses the 9003 bulb for both high beam and low beam headlight positions across the 1982-1983 model years.
Because the 9003 is a dual-filament bulb, a single unit serves both beam functions rather than requiring separate bulbs for each headlight mode.
The P43t base is a bayonet-style fitting with a 43mm collar, which physically determines bulb-to-socket compatibility. A bulb with a different base type will not seat correctly regardless of its electrical ratings.
The 9003 shares its filament and voltage configuration with the H4 bulb, though the two differ in base design. The H4 uses a P43t base as well, making them electrically equivalent, but fitment compatibility depends on the specific socket design of the application.