Kenworth K300 front side marker bulbs use 1157 and 67 sizes, while rear side marker bulbs use 904 size. The replacement chart covers 1993 to 1997 vehicle 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 Kenworth K300 front side marker position uses the 1157 bulb for 1993 and 1995-1997, while the 1994 model year uses the 67 bulb instead.
The 1157 is a dual-filament bulb rated at 12V with a 21W main filament and a 5W secondary filament, mounted on a BAY15d bayonet base.
The BAY15d base features offset pins, which physically prevents it from being interchanged with single-filament bulbs that use the BA15s base.
The 67 bulb specified for the 1994 Kenworth K300 front side marker is a single-filament type with a BA15s bayonet base, rated at 12V and 8W.
Because the 1157 uses a BAY15d base and the 67 uses a BA15s base, these two bulbs are not interchangeable despite both being ANSI-standard 12V bayonet types.
The 67 bulb is a lower-wattage variant of the 1156 family, drawing 8W compared to the 1156's higher output, and it serves only a single-filament function.
The Kenworth K300 rear side marker position uses the 904 bulb across all listed model years, 1993-1997, without variation.
The 904 is a miniature wedge bulb in the T10 form factor, rated at 12V and 8W, and its wedge base design differs from the bayonet bases found on the 1157 and 67 bulbs.
Because the 904 uses a wedge base, it is not interchangeable with either the 1157 or the 67, which both rely on bayonet-style mounting.
All three bulb types specified for the Kenworth K300, the 1157, 67, and 904, conform to ANSI standards applicable in both the United States and Canada.