Ferrari 348 TS front and rear side marker bulbs utilize a 158 size bulb for replacement applications. The replacement chart covers 1989 to 1992 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 Ferrari 348 TS uses the 158 bulb for both front and rear side markers across the 1989-1992 model years.
The 158 is a miniature wedge-type bulb, classified under the T10 form factor, which refers to a tubular glass envelope roughly 10/8 of an inch wide.
The 158 operates at 12 volts and draws 3 watts, placing it in the low-power range typical of side marker applications.
The 158 designation follows the ANSI standardization system, meaning it is a recognized specification in both the United States and Canada.
The wedge base design of the 158 means the bulb is held in its socket by the tension of the glass pinch rather than a metal bayonet or screw base, which is a common trait in small automotive lighting positions.
The uniform use of the 158 across all four model years and across both the front and rear positions indicates a single bulb type covers all side marker sockets on the 348 TS.