BMW Motorcycle K75S uses 9003 bulb size for both high beam and low beam headlight applications. The replacement chart covers 1987 to 1992 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 is a dual-filament halogen bulb operating at 12 volts, with a high beam filament rated at 60 watts and a low beam filament rated at 55 watts. Its base type is P43t, a standardized bayonet-style fitting widely used in automotive and motorcycle lighting.
The BMW Motorcycle K75S uses the 9003 bulb for both the high beam and low beam headlight positions across all listed model years, meaning a single bulb type serves both lighting functions simultaneously through its dual-filament design.
The 9003 designation follows the ANSI standard, which applies to the United States and Canada. This classification system defines the bulb's electrical ratings, base type, and filament configuration to ensure consistent performance across compliant products.
The K75S headlight specifications cover the 1987-1988 and 1991-1992 model years, all of which share an identical 9003 fitment for both beam positions.
Because the 9003 bulb handles both high and low beam functions within a single unit, the headlight housing on the K75S does not require separate bulbs for each beam mode. Replacing one bulb addresses both lighting functions.
The P43t base is a specific physical interface between the bulb and the headlight socket. Bulbs with a different base type are not mechanically compatible with a socket designed for P43t, regardless of similar voltage or wattage ratings.