The Ferrari 348 Spider front and rear side marker bulbs both utilize a 158 size bulb configuration. The replacement chart covers 1993 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 Ferrari 348 Spider uses the 158 bulb for both front and rear side markers across the 1993-1995 model years.
The 158 is a miniature wedge-type bulb, classified under the T10 form factor, which refers to a tubular bulb roughly 10mm in width with a wedge-style base that requires no separate socket retainer.
The 158 bulb operates at 12 volts and draws 3 watts, placing it in the low-wattage range typical of side marker and courtesy lighting applications.
The 158 designation follows ANSI standardization, meaning the specification is recognized across the United States and Canada under a common industry numbering system.
Because the same bulb size applies to both the front and rear side marker positions on the Ferrari 348 Spider, a single bulb type services all four side marker positions on the vehicle.
The T10 wedge base format is a widely produced form factor, though substitution with other T10-based bulbs requires confirmation that voltage and wattage ratings match the 158 specification to avoid electrical or fitment issues.