The Mazda RX-2 front and rear turn signal bulbs both utilize a 1157 size bulb for proper operation. The replacement chart covers 1973 to 1974 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 1157 is the sole bulb type listed across all turn signal positions for the Mazda RX-2, covering both the 1973-1974 model years.
The 1157 is a dual-filament bulb, meaning it serves two distinct lighting functions within a single unit, typically combining a higher-wattage filament for active signaling and a lower-wattage filament for a steady running or parking light.
The 1157 operates on a 12-volt electrical system and carries a wattage rating of 21W on the primary filament and 5W on the secondary filament.
The 1157 uses a BAY15d bayonet base, which is an offset twin-pin mount. The pin offset is a deliberate design feature that prevents incorrect insertion of the bulb into the socket.
The 1157 is classified under the ANSI standardization system and is specified for use in the United States and Canada, indicating regional standardization of the socket and bulb interface.
The same 1157 bulb specification applies to both the front and rear turn signal positions on the RX-2 for 1973-1974, indicating socket uniformity across those positions.
Because the 1157 is a dual-filament type, substituting it with a single-filament equivalent such as the 1156 would result in the loss of one lighting function, as the 1156 shares the same bayonet base style but lacks the second filament.