The Ford EXP front side marker bulb size measures 2357 or 194, while the rear side marker bulb size measures 194. The replacement chart contains bulb specifications covering 1982 to 1988 vehicle production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ford EXP front side marker position uses two distinct bulb types across its production run, with the 194 fitted to the 1982-1986 model years and the 2357 fitted to the 1987 model year.
The rear side marker position on the Ford EXP uses the 194 bulb across all listed model years, spanning 1982-1988.
The 194 is an ANSI-standard miniature wedge bulb in the T10 form factor, rated at 12V and 3.78W, and is a single-filament design suited to low-draw marker lighting applications.
The 2357 is an ANSI-standard dual-filament bulb with a BAY15d bayonet base, rated at 12V with filament outputs of 26.9W and 8W, making it significantly more powerful than the 194.
The BAY15d base of the 2357 is a double-contact bayonet fitting, which is physically and electrically incompatible with the wedge socket used by the 194, meaning the two bulb types are not interchangeable.
The 2357 is noted as a brighter variant of the 1157, sharing the same BAY15d base and dual-filament configuration, though the 2357 produces higher wattage output on its primary filament.
Because the 1987 front side marker socket was designed for the 2357's bayonet base, substituting a 194 wedge bulb in that position would require a socket adapter or would result in an improper fit.
Both the 194 and 2357 conform to ANSI standards recognized in the United States and Canada, indicating standardized electrical and physical specifications across manufacturers.