Buick Gran Sport License Plate Bulb Size

The Buick Gran Sport license plate light requires a bulb size of 97 for the rear exterior illumination. Data for the specific bulb requirements covers the range from 1965 to 1967.

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
1965-1967	97

Bulb Specifications

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

Other Locations

Additional Notes

The bulb type 97 is an ANSI-standardized single-filament bulb operating at 12 volts and 13 watts, fitted with a BA15s bayonet base.
The Buick Gran Sport uses the 97 bulb for the license plate position across the 1965-1967 model years.
The BA15s base designation indicates a single-contact bayonet fitting with a 15mm base width, which is distinct from dual-contact variants and is not interchangeable with them.
The 97 bulb is a variant of the 1156, though the two are not identical and substitution between them warrants verification of wattage and base compatibility for the specific application.