The Mazda RX-7 front side marker requires a 168, 194, or 89 bulb size, while the rear side marker uses a 194 or 89 bulb size. The replacement chart covers 1979 to 1995 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 Mazda RX-7 front and rear side marker positions draw from three distinct bulb types across the model's production span: the 168, 194, and 89.
The 194 bulb is the most widely used across both positions. It is an ANSI-standard miniature wedge bulb in the T10 form factor, rated at 12V and 3.78W, and it covers the rear side marker for every listed year except 1979.
The 168 bulb shares the same T10 miniature wedge form factor as the 194 but draws slightly more power at 4.9W versus 3.78W. Despite this physical similarity, the two are not the same specification and are listed separately in the ANSI standard.
The Mazda RX-7 front side marker uses the 168 bulb for the 1993-1995 model years, while all earlier years from 1980-1991 use the 194 in that same position.
Because the 168 and 194 share the T10 wedge base, physical installation may be possible interchangeably, but their wattage ratings differ, which can affect socket load and compatibility with the vehicle's original electrical design.
The 1979 Mazda RX-7 stands apart from all other listed years in that both the front and rear side marker positions use the 89 bulb rather than a T10 wedge type.
The 89 bulb uses a BA15s single-contact bayonet base, which is physically incompatible with the T10 wedge sockets used in later model years. It is rated at 12V and 13W, making it significantly higher in wattage than either the 168 or 194.
The 89 bulb is described as a lower-wattage variant of the 1156, which itself is a common single-filament automotive bulb. Both share the BA15s bayonet base but differ in wattage output.
No single bulb type serves both the front and rear side marker positions across all listed years simultaneously, with the exception of the 194, which covers both positions for 1980-1991 and the rear position through 1995.
The 1992 model year is absent from both the front and rear side marker specifications for the Mazda RX-7.