Chevrolet K5 Blazer License Plate Bulb Size

The Chevrolet K5 Blazer license plate light uses bulb sizes 67 and 97 for the rear illumination components. Data for the specified vehicle covers the range from 1975 to 1986.

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 Type	Shop
1980-1986	67	Check Price
1975-1979	97	Check Price

Bulb Specifications

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

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Additional Notes

The Chevrolet K5 Blazer uses two distinct bulb sizes for the license plate position across its 1975-1986 model years: the 67 and the 97.
Both the 67 and 97 are ANSI-standardized bulbs recognized in the United States and Canada, and both feature a single filament with a BA15s bayonet base operating at 12 volts.
The BA15s bayonet base is a single-contact design, which corresponds to the single-filament construction of both bulb types used in this application.
The 67 bulb is rated at 8 watts, while the 97 is rated at 13 watts, meaning the 97 draws noticeably more current and produces greater output for the same 12-volt supply.
The 67 and 97 are both described as variants of the 1156 bulb family, yet their wattage ratings differ from each other and from the standard 1156, which is rated at approximately 26.9 watts.
Because the 67 and 97 share the same BA15s bayonet base, physical installation in the socket is mechanically possible with either bulb, but their wattage difference represents a meaningful electrical distinction.
The Chevrolet K5 Blazer (1980-1986) specifies the 67 bulb for the license plate position, reflecting the lower 8-watt rating for that generation.
The 1975-1979 model years specify the 97 bulb, which carries the higher 13-watt rating, indicating a different electrical specification for the license plate circuit during that period.
The transition between bulb sizes occurs between the 1979 and 1980 model years, representing a shift from the 97 to the 67 in the license plate position.
Substituting the 97 for the 67, or vice versa, in the license plate socket would result in a mismatch with the original wattage specification for that model year, even though the base type is shared.