The Isuzu EVR uses 89 bulb size for both front and rear side marker applications. The replacement chart covers 1987 to 1993 vehicle 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 Isuzu EVR uses the 89 bulb for both front and rear side marker positions across all listed model years from 1987-1993.
The 89 bulb is an ANSI-standardized type recognized in both the United States and Canada, operating at 12 volts and 13 watts.
It is a single-filament bulb, meaning it serves one lighting function rather than combining two, such as stop and tail, within a single unit.
The 89 bulb uses a BA15s bayonet base, which is a single-contact bayonet mount that locks into the socket with a twist-and-push motion.
The 89 is a lower-wattage variant of the 1156 bulb, which shares the same BA15s base type but draws more power at approximately 26.9 watts.
Because the 89 and 1156 share the same base, physical fitment into the socket is possible with either type, though their wattage ratings differ significantly.
The Heavy Duty designation associated with the 89 bulb in these specifications indicates a construction intended for the more demanding operating conditions typical of commercial vehicles.
The consistent use of a single bulb type across both the front and rear side marker positions on the EVR means the same bulb serves all four side marker sockets on the vehicle.