The Alfa Romeo Milano brake light requires a P21W bulb size for proper installation and function within the rear lighting assembly. Data for the specified component covers the range from 1987 to 1989.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Alfa Romeo Milano uses two bulb types across its brake light positions for the 1987-1989 model years: the P21W for the standard brake lights and the 1156 for the Center High Mount Stop Light.
The P21W is governed by ECE standards, which apply to European and worldwide markets, while the 1156 follows ANSI standards used in the United States and Canada.
Despite originating from different standardization bodies, both the P21W and 1156 operate at 12 volts with a 21-watt output and share a single-filament design.
Both bulb types use a BA15s bayonet base, a single-contact base with one locating pin on the side of the metal cap.
The shared BA15s base between the P21W and 1156 does not automatically indicate interchangeability, as the differing regional standards may involve variations in construction or certification that affect fitment suitability.
The standard brake light position on the Alfa Romeo Milano calls for the P21W across all three listed model years, 1987-1989.
The Center High Mount Stop Light on the Alfa Romeo Milano is specified with the 1156 for the same 1987-1989 span, reflecting the ANSI-standard fitment used in that position.