The Ferrari Mondial 3.2 front turn signal requires a 1157, P21W, or 1073 bulb size, while the rear turn signal uses a P21W bulb size. The replacement chart covers 1986 to 1988 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 Mondial 3.2 front turn signal uses three different bulb types across the 1986-1988 model years, while the rear turn signal uses the P21W exclusively across all three years.
The P21W is an ECE-standard bulb rated at 12V and 21W, built around a BA15s single-contact bayonet base. Its single filament is dedicated entirely to signalling functions.
The 1157 is an ANSI-standard bulb rated at 12V with a dual-filament configuration of 21W and 5W. It uses a BAY15d bayonet base, which offsets its two contact pins to prevent incorrect installation.
The 1073 is an ANSI-standard single-filament bulb rated at 12V and 13W. It shares the BA15s bayonet base with the P21W but operates at a lower wattage, functioning as a reduced-output variant of the 1156 bulb family.
The 1988 Ferrari Mondial 3.2 front turn signal takes the 1157, a dual-filament bulb, while the 1987 model uses the P21W, a single-filament bulb. These two types are not interchangeable despite both using 12V systems, as they differ in filament count and base type.
The 1986 front turn signal position uses the 1073, which shares its BA15s base with the P21W used in the rear. However, the wattage difference between the two (13W versus 21W) means they serve distinct electrical roles and are not direct substitutes.
The BAY15d base of the 1157 is physically distinct from the BA15s base shared by the P21W and 1073. The offset pins of the BAY15d prevent it from seating into a BA15s socket, making cross-installation between the 1157 and the other two types mechanically impossible.