Peterbilt 357 License Plate Bulb Size

Additional Notes

• The bulb size 67 is the dominant fitment across the Peterbilt 357 license plate bulb specifications, appearing as the standard option for every model year listed from 1986 through 2008.
• The 67 bulb is an ANSI-standard single-filament type rated at 12V and 8W, mounted on a BA15s bayonet base, and is classified as a lower wattage variant of the 1156 bulb family.
• The bulb size 97 is an alternative fitment specified exclusively for the Peterbilt 357 model years 1986-1997, and only when the vehicle is equipped with halogen capsule headlamps.
• The 97 bulb shares the same ANSI-standard single-filament construction and BA15s bayonet base as the 67, but operates at a higher wattage of 13W at 12V, placing it closer to the full 1156 specification.
• Both the 67 and 97 bulbs use the identical BA15s bayonet base, meaning the physical mounting interface is the same between the two types; however, the wattage difference makes them non-interchangeable without accounting for the specific headlamp configuration of the vehicle.
• From 1998 onward through 2008, the specifications list only the 67 bulb with no alternative fitment, indicating that the halogen capsule headlamp condition relevant to the 97 bulb applies solely to the 1986-1997 production range.
• The dual-bulb specification present in model years 1986-1997 reflects a configuration-dependent fitment, where the headlamp system type on the Peterbilt 357 directly determines the correct license plate bulb size.