Fiat X-1/9 Brake Bulb Size

The Fiat X-1/9 brake light utilizes unique bulb sizes 1157, 1073, and P21W depending on the specific production requirements for the vehicle. Available data for the lighting components covers the range from 1974 to 1983.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

YearsBulb Size
1983P21W
19821073
1981P21W
1974-19801157

Bulb Specifications

Description Bulb Size
ECE standard (Europe & worldwide). Single-filament signalling bulb with BA15s bayonet base. 12V, 21W.P21W
ANSI standard (US & Canada). Single-filament bulb with BA15s bayonet base. Lower wattage variant of 1156. 12V, 13W.1073
ANSI standard (US & Canada). Dual-filament bulb with BAY15d bayonet base. 12V, 21W/5W.1157

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