Subaru Justy front turn signal bulbs use 921 or 1156 size specifications, while rear turn signal bulbs require 1156 size. The replacement chart covers 1987 to 1994 production years with corresponding bulb size data.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Subaru Justy turn signal specifications cover model years 1987-1994, spanning both front and rear positions.
Two bulb types appear across these specifications: the 921 and the 1156, both of which conform to ANSI standards for the US and Canadian markets.
The 921 is a wedge-type bulb in the T15 form factor, rated at 12V and 16W. Its wedge base requires no separate metal socket, as the glass envelope itself acts as the retention mechanism.
The 1156 is a single-filament bulb with a BA15s bayonet base, rated at 12V and 21W. The BA15s designation indicates a single-contact bayonet fitting with a 15mm base width, which locks into place with a twist.
At 21W, the 1156 draws more power than the 921 at 16W. These two bulbs are not interchangeable, as they differ in both base type and wattage.
The Subaru Justy front turn signal uses the 921 bulb for model years 1989-1994, while the 1987-1988 front turn signal uses the 1156.
The rear turn signal on the Subaru Justy uses the 1156 bulb across all listed model years, 1987-1994, without variation.
Because the front turn signal changed from the 1156 to the 921 between the 1988 and 1989 model years, parts sourced for one generation of the front housing are not compatible with the other.