The UD 2300 uses 1156 bulb size for both front and rear turn signal applications. Replacement chart data spans 1995 to 1998 model 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 is the sole bulb type specified for the UD 2300 across all listed turn signal positions and model years.
The 1156 is a single-filament bulb, meaning it serves one lighting function per socket rather than combining two functions such as braking and signaling within a single unit.
It operates on a 12-volt electrical system and draws 21 watts, placing it in the standard incandescent range for automotive turn signal applications.
The 1156 uses a BA15s bayonet base, a single-contact fitting where the bulb is inserted and rotated to lock into place, as opposed to a double-contact BA15d base used by some visually similar bulbs.
The BA15s designation is a critical fitment detail, as double-contact bayonet bulbs such as the 1157 share a similar physical profile but are not interchangeable with BA15s sockets.
The 1156 carries ANSI standardization applicable in both the United States and Canada, indicating the bulb conforms to a recognized North American specification for dimensions, base type, and electrical output.
The front and rear turn signal positions on the UD 2300 share the same 1156 specification across the 1995-1998 model years covered in the data.