The Subaru XT high beam and low beam headlight bulbs both utilize the H6054 size. The replacement chart covers vehicle production spanning 1985 to 1991.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Subaru XT uses the H6054 bulb size for both high beam and low beam headlights across the entire 1985-1991 production run.
The H6054 is an ANSI-standardized sealed beam unit, meaning the lens, reflector, and filament are fused into a single non-serviceable assembly. When the filament fails, the entire unit is replaced rather than an individual bulb.
The H6054 unit follows a 5x7-inch rectangular form factor, which is a common sealed beam format shared across numerous North American vehicle applications of that era, making replacement units widely available.
The H6054 operates at 12 volts, consistent with standard automotive electrical systems.
The H6054 designation carries ANSI standardization recognized in both the United States and Canada, meaning units from different manufacturers conforming to this standard are physically and electrically interchangeable.
Because the Subaru XT (1985-1991) uses the same H6054 unit for both high and low beam functions, the vehicle relies on a dual-filament sealed beam design rather than separate housings for each beam mode.