Alfa Romeo 164 front and rear side marker bulbs utilize a 168 bulb size for illumination. The replacement chart covers 1991 to 1995 vehicle 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 168 bulb is the sole side marker bulb size specified for the Alfa Romeo 164 across all listed model years, covering both front and rear positions from 1991-1995.
The 168 bulb follows the ANSI standard recognized in the United States and Canada, meaning it conforms to a defined set of electrical and physical specifications governed by that standardization body.
It belongs to the T10 miniature wedge form factor, a base type that relies on two angled plastic fins rather than a metal screw or bayonet fitting to secure the bulb within its socket.
The bulb operates at 12 volts, consistent with the standard electrical system voltage found in conventional passenger vehicles.
Its rated wattage of 4.9W places it in the low-power range typical of side marker applications, where output requirements are modest compared to headlamp or brake lamp positions.
Because the same bulb size applies to both the front and rear side marker positions, a single bulb type serves all four side marker sockets on the vehicle.
The T10 wedge base is a widely produced form factor, and the 168 designation identifies a specific variant within that family defined by its voltage and wattage ratings rather than by base type alone.
Substituting a T10 wedge bulb with a different ANSI number risks a wattage or voltage mismatch even when the physical base fits the socket, since multiple 168-adjacent designations share the same base geometry.