Kenworth T450 front and rear side marker bulbs utilize 1157, 904, and 67 bulb sizes depending on location and production specifications. The replacement chart covers 1993 through 1997 model years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Kenworth T450 front side marker uses two distinct bulb types across its 1993-1997 model years: the 1157 and the 904. These are not interchangeable, as they differ in base type, filament count, and wattage.
The 1157 is a dual-filament bulb rated at 12V with a 21W/5W output and a BAY15d bayonet base. Its dual-filament design means it serves two lighting functions within a single housing.
The 904 is a single-function miniature wedge bulb in a T10 form factor, rated at 12V and 8W. Its wedge base is physically incompatible with the BAY15d socket used by the 1157.
For the front side marker position, the 1993, 1994, and 1997 T450 models take the 1157, while the 1995-1996 models take the 904.
The rear side marker position on the T450 uses three different bulb types across the same model year span, with the 904, the 67, and no single type covering all five years.
The 67 bulb is a single-filament type with a BA15s bayonet base, rated at 12V and 8W. Although it shares a bayonet base family with the 1157, the BA15s and BAY15d bases are not interchangeable due to differing pin offsets.
The rear side marker on the 1996 and 1993 T450 models uses the 67 bulb, while the 1994, 1995, and 1997 models use the 904.
All three bulb types specified for the Kenworth T450 side markers conform to ANSI standards applicable in both the United States and Canada.
The 67 is described as a lower wattage variant of the 1156. Despite the shared BA15s base, the 67 and 1156 differ in wattage output, and substituting one for the other may affect circuit load and light intensity.
No single bulb type covers both the front and rear side marker positions across all model years of the T450, which means a single-bulb replacement stock is insufficient to service the full 1993-1997 range.