The Ford Country Squire brake light utilizes 1157, 1034, and 1154 bulb sizes depending on the specific production period for the vehicle. Available data covers the historical span from 1950 through 1991.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Ford Country Squire uses three distinct bulb types across its brake light specifications: the 1157, 1034, and 1154 for the standard brake lights, and the 912 for the center high mount stop light on later models.
The 1157 is the most widely specified bulb across the Country Squire's brake light history, covering model years 1963-1991 with a gap between 1974 and 1987.
The 1157 is a dual-filament bulb operating at 12V with a 21W/5W output, mounted on a BAY15d bayonet base, which allows it to serve both brake and tail light functions within a single housing.
The 1034 is specified for the Ford Country Squire from 1956-1962 and shares the same BAY15d bayonet base and 12V, 21/5W electrical ratings as the 1157, making it a variant of that bulb type.
The 1154 is specified for model years 1950-1955 and is an older dual-filament variant of the 1157, also using the BAY15d bayonet base but rated for both 6V and 12V operation, reflecting the electrical system standards of that era.
Although the 1034 and 1157 share the same BAY15d base and wattage ratings, they are distinct ANSI part numbers, and substitution between them warrants verification against the specific model year requirement.
The 912 is a wedge-base bulb of the T15 type, rated at 12V and 12W, and is specified exclusively for the center high mount stop light on the Country Squire from 1987-1991.
The 912 is classified as a variant of the 921 bulb, meaning the two share a close relationship in form and function, though they carry separate ANSI designations.
The center high mount stop light, present on the 1987-1991 Country Squire, is a single-filament application using the 912 wedge bulb, which is electrically and physically distinct from the dual-filament BAY15d bulbs used in the standard brake light positions.
All four bulb types specified for the Ford Country Squire conform to ANSI standards applicable in both the United States and Canada.