Peterbilt 320 License Plate Bulb Size

The Peterbilt 320 license plate light uses bulb sizes 67 and 97 for the exterior illumination components. Available data for the lighting specifications covers the range from 1987 to 2009.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Size
1998-2009	67
1987-1997	67
1987-1997	97 (With Halogen Capsule Headlamps)

Bulb Specifications

Description	Bulb Size
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 8W.	67
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Variant of 1156. 12V, 13W.	97

Other Locations

Additional Notes

The Peterbilt 320 uses the bulb 67 as the license plate bulb across all listed model years, spanning 1987-2009.
The bulb 67 is an ANSI-standardized type rated at 12V and 8W, built on a BA15s single-contact bayonet base with a single filament.
The bulb 97 is specified as an alternative license plate bulb for the Peterbilt 320 in model years 1987-1997, but only in vehicles equipped with halogen capsule headlamps.
The bulb 97 shares the same BA15s bayonet base and single-filament construction as the 67, and operates at 12V, but draws 13W rather than 8W.
Both the 67 and 97 are ANSI-standard types recognized in the US and Canadian markets, and both are classified as variants of the 1156 bulb family.
Because the 67 and 97 share the same BA15s base, they are physically interchangeable in terms of socket fitment, though their wattage ratings differ and the correct type is determined by the headlamp configuration of the vehicle.
From 1998 onward, the specifications list only the bulb 67 for the license plate position, with no alternative fitment noted for any headlamp configuration.
The halogen capsule headlamp condition that triggers the bulb 97 fitment is present only in the 1987-1997 model year entries, making headlamp type a relevant factor when selecting a license plate bulb for those years.