The UD 1800 uses 1156 bulb size for both front and rear turn signal applications. The replacement chart covers 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 UD 1800 uses the 1156 bulb across all listed model years (1995-1998) for both front and rear turn signals.
The 1156 is a single-filament bulb, meaning it is dedicated to one lighting function rather than serving dual purposes such as combined stop and turn signal operation.
It operates on a 12-volt electrical system and draws 21 watts, which is a standard power rating for incandescent turn signal applications.
The 1156 uses a BA15s bayonet base, a single-contact mount where the bulb is inserted and twisted to lock into the socket.
The 1156 designation follows ANSI standards recognized in both the United States and Canada, indicating a standardized specification for the bulb's electrical and physical characteristics.
Because the same bulb size is specified for both the front and rear turn signal positions across all listed years, the 1156 is interchangeable between those two positions on the UD 1800.