The Pontiac Executive front and rear side marker bulb sizes measured 194 and 194NA for front applications, while rear positions utilized 194 and 1893 bulb sizes. The replacement chart covers 1968 to 1970 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 194 bulb is the most frequently specified type across the Pontiac Executive side marker positions, appearing in both the front and rear locations for 1970 and in the rear for 1969.
The 194 is an ANSI-standard miniature wedge bulb in the T10 form factor, rated at 12V and 3.78W, and is recognized for use in both the United States and Canada.
The 194NA shares the same T10 wedge form factor, voltage, and wattage as the 194 but is fitted with natural amber glass, which produces a colored output without the use of a separate lens filter.
The 1893 is an ANSI-standard miniature wedge bulb in the smaller T5 form factor, rated at 12V and 2W, making it a lower-wattage type than the T10-based 194 and 194NA.
The front side marker of the Pontiac Executive uses the 194NA for 1969, while the 1970 position calls for the standard 194. Although both are T10 wedge bulbs with identical electrical ratings, the amber glass coating on the 194NA is a physical difference that distinguishes it from the clear 194.
The rear side marker for the 1968 Pontiac Executive uses the 1893, a T5 wedge bulb, which is a physically smaller and lower-wattage type than the T10-based 194 used in the same position for 1969 and 1970. These two bulb types are not interchangeable.