The Kenworth K220 front side marker uses 904, 1157, or 67 bulb sizes, while the rear side marker requires 904 or 67 bulb sizes. The replacement chart covers 1988 to 1994 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 K220 front and rear side marker positions draw from three distinct ANSI-standard bulb types across the model years covered in the specifications: the 904, 1157, and 67.
The 904 is a miniature wedge-base bulb in the T10 form factor, rated at 12V and 8W. It is the most frequently specified bulb across both the front and rear side marker positions of the K220.
The rear side marker of the Kenworth K220 uses the 904 bulb for 1989-1994, with the sole exception of 1988, which uses the 67 instead.
The 1157 is a dual-filament bulb with a BAY15d bayonet base, rated at 12V with a 21W/5W filament configuration. Its dual-filament design distinguishes it from the other two bulb types specified for this vehicle.
The 67 is a single-filament bulb with a BA15s bayonet base, rated at 12V and 8W. It is described as a lower wattage variant of the 1156 bulb type.
The front side marker position shows variation across years, with the 904 specified for 1989 and 1994, the 1157 for 1988 and 1992, and the 67 for 1990-1991.
The 1157 and 67 bulbs both use bayonet-style bases but are not interchangeable. The 1157 uses a BAY15d base with dual contact pins offset at different heights, while the 67 uses a BA15s base with a single contact, making physical fitment mutually exclusive.
The 904 wedge base and the bayonet-base bulbs (1157 and 67) are mechanically incompatible with one another, as wedge and bayonet sockets require different housing designs.
Despite sharing the same 12V, 8W rating, the 904 and 67 are not interchangeable due to their different base types, a wedge base versus a BA15s bayonet base respectively.
The front side marker position of the K220 does not use a single consistent bulb type across all listed years, meaning the correct bulb is year-specific for that position.