The Mazda RX-3 front and rear side marker bulbs both utilize an 89 size bulb configuration. The replacement chart covers vehicle production spanning 1972 to 1978 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 Mazda RX-3 uses the 89 bulb for both front and rear side marker positions across the 1972-1978 model years.
The 89 is an ANSI-standardized bulb type, meaning its physical and electrical specifications conform to a defined industry standard recognized in both the United States and Canada.
The 89 bulb operates on a 12-volt electrical system and draws 13 watts, placing it in the low-wattage range typical of side marker applications.
It is a single-filament bulb, meaning it serves only one lighting function rather than switching between two brightness levels as a dual-filament bulb would.
The 89 uses a BA15s bayonet base, which is a single-contact bayonet mount. The "s" designation indicates a single contact pin, distinguishing it from the dual-contact BA15d variant.
The 89 is described as a lower-wattage variant of the 1156. While both share the BA15s bayonet base, the 1156 operates at a higher wattage, and the two are not directly interchangeable without accounting for that electrical difference.
Because the same bulb type is specified for both the front and rear side marker positions, a single replacement bulb covers both locations on the vehicle.