Kenworth T300 front and rear side marker bulbs utilize 67 and 904 bulb sizes respectively. The replacement chart covers 1995 to 1997 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 T300 side marker lighting across the 1995-1997 model years relies on two bulb types: the 67 and the 904, both rated at 12V and 8W under ANSI standards recognized in the US and Canada.
The 904 is a miniature wedge bulb in the T10 form factor, which uses a wedge-style base that seats directly into a compatible socket without a separate locking mechanism.
The 67 uses a BA15s bayonet base, a single-contact bayonet mount that requires an alignment pin and a twist to lock into its socket, making it physically incompatible with wedge-style sockets.
Although both the 67 and 904 share identical voltage and wattage ratings of 12V and 8W, their base types are entirely different, and one cannot substitute for the other without a socket adapter or housing modification.
The 67 is described as a lower wattage variant of the 1156 bulb. The 1156 is a common BA15s single-filament bulb rated at approximately 26.9W, meaning the 67 draws significantly less current despite sharing the same base type.
For the 1995-1996 Kenworth T300, both the front and rear side marker positions use the 904 bulb, meaning a single bulb type serves all four side marker locations in those model years.
In the 1997 Kenworth T300, the front side marker position shifts to the 67 bulb while the rear side marker retains the 904, resulting in two different bulb types across the four side marker positions that year.
The front side marker socket on the 1997 Kenworth T300 is designed for a BA15s bayonet mount, which is incompatible with the wedge-style 904 used in the same position on 1995-1996 models.