Mitsubishi Fuso FM-SP front turn signal bulbs use 1156 size while rear turn signal bulbs use P21W size. The replacement chart covers 1996 to 1998 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 1156 and P21W bulb types appear across all listed model years of the Mitsubishi Fuso FM-SP, covering the 1996-1998 range for both front and rear turn signal positions respectively.
Both the 1156 and P21W are single-filament bulbs rated at 12V and 21W, meaning neither is designed to serve dual lighting functions such as combined stop and turn signalling.
The 1156 is classified under the ANSI standard, which governs bulb specifications in the United States and Canada, while the P21W follows the ECE standard used in Europe and internationally.
Despite originating from different standardization systems, both bulbs share the BA15s bayonet base, a single-contact base type with a 15mm collar width.
The shared BA15s base between the 1156 and P21W means the two bulbs are physically interchangeable in terms of socket fitment, though they are governed by different regional standards.
The front turn signal on the Mitsubishi Fuso FM-SP uses the 1156 for the 1996-1998 model years, placing it within the North American ANSI specification framework.
The rear turn signal on the FM-SP uses the P21W for the 1996-1998 model years, which reflects an ECE-standard component in that position.
The identical wattage and voltage ratings of 21W at 12V across both bulb types indicate equivalent electrical load characteristics, which is relevant when assessing compatibility with the vehicle's turn signal flasher relay.