Mitsubishi Fuso FM-SP front and rear side marker bulbs utilize 89 size bulbs for replacement purposes. The replacement chart covers vehicle production spanning 1996 to 1998.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Mitsubishi Fuso FM-SP uses the 89 bulb for both front and rear side marker positions across the 1996-1998 model years.
The 89 is an ANSI-standardized bulb type recognized across the United States and Canada, operating at 12 volts and 13 watts.
The 89 bulb uses a BA15s bayonet base, which is a single-contact base design with a 15mm collar and a single locating pin on the side.
As a single-filament bulb, the 89 serves one lighting function per socket, which is consistent with its application in side marker positions.
The 89 is a lower wattage variant of the 1156 bulb. While both share the BA15s bayonet base, the 1156 operates at a higher wattage, making the two types non-equivalent as direct replacements despite their physical similarity.
The shared bulb specification across both the front and rear side marker positions on the FM-SP means a single bulb type services all four side marker sockets on the vehicle.