White WIS front and rear side marker bulbs utilize 1157 and 194 bulb sizes for the front position and 194 size for the rear position. The replacement chart covers 1984 to 1988 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 widely used type across these specifications, appearing in both the front and rear side marker positions for the White WIS across 1984-1987, as well as the rear side marker position for 1988.
The 194 is a miniature wedge bulb of the T10 type, rated at 12V and 3.78W, and follows the ANSI standard applicable in both the United States and Canada.
The T10 wedge base of the 194 bulb is a friction-fit design, meaning it does not use a bayonet or screw mechanism for retention.
The 1157 bulb is specified exclusively for the front side marker position on the 1988 White WIS, distinguishing that model year from all others in this dataset.
The 1157 is a dual-filament bulb rated at 12V with a 21W/5W output, where the two wattage values correspond to its high and low filaments respectively.
The 1157 uses a BAY15d bayonet base, which is an offset double-contact base. This offset pin configuration prevents incorrect installation by ensuring the bulb can only be seated in one orientation.
Because the 1157 and 194 are physically and electrically incompatible, the front side marker socket on the 1988 White WIS does not accept the 194 bulb used in all other positions and model years.
Both the 1157 and 194 are ANSI-standardized bulbs, meaning their specifications are governed by a common North American standard rather than proprietary manufacturer sizing.