The Buick Apollo front and rear side marker bulbs both utilize a 194 bulb size. The replacement chart covers 1973 through 1975 production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 194 bulb is the sole bulb type across all side marker positions on the Buick Apollo, covering both front and rear applications for the 1973-1975 model years.
The 194 bulb follows the ANSI standard recognized in both the United States and Canada, meaning it conforms to a standardized specification shared across North American markets.
It is a miniature wedge-style bulb, classified under the T10 form factor. The wedge base design means the bulb is held in its socket by the tension of the base itself rather than by a separate bayonet or screw mechanism.
The 194 operates at 12 volts, which is consistent with the standard electrical system voltage found in conventional passenger vehicles of this era.
Its rated wattage of 3.78W places it in the low-power range, typical of side marker lamps that serve a visibility and signaling function rather than primary illumination.
Because the Buick Apollo (1973-1975) uses the same 194 bulb in both the front and rear side marker positions, a single bulb type serves all four side marker sockets on the vehicle.