Subaru Impreza front and rear side marker bulb sizes include 12961, 168, 194, 7443, and 1157 specifications. The replacement chart covers vehicle production years from 1993 to 2024 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 T10 wedge form factor is the most prevalent bulb type across the Subaru Impreza's front side marker positions, appearing in three distinct part numbers: 12961, 168, and 194, all operating at 12V.
The 168 bulb, an ANSI-standard T10 wedge rated at 12V and 4.9W, serves as the front side marker for the 2015-2019 Impreza and also carries over to the rear side marker position on the 2017-2019 model years.
The 194 bulb, also an ANSI-standard T10 wedge but rated at a lower 3.78W, is specified for the front side marker on the 1993-2001 Impreza. Its lower wattage distinguishes it from the otherwise physically similar 168 bulb.
Although the 168 and 194 share the same T10 wedge base, their wattage ratings differ, which is a relevant fitment consideration when one is substituted for the other.
The 2024 Impreza front side marker uses the 12961, a Philips-branded T10 wedge with a W2.1x9.5d base rated at 12V and 5W. Unlike the 168 and 194, this is a manufacturer-specific part number rather than an ANSI standard designation.
The rear side marker on the 2015-2016 Impreza uses the 7443, a T20 dual-filament wedge bulb rated at 12V with a 21W high filament and 5W low filament. This is a physically larger bulb than the T10 types used in other positions.
The 1157 bulb, specified for the rear side marker on the 1993-2001 Impreza, is a dual-filament type with a BAY15d bayonet base rated at 12V, 21W/5W. Its bayonet base makes it mechanically incompatible with the wedge-base sockets used in other Impreza marker positions.
The rear side marker position on the 1993-2001 Impreza uses the 1157 with a BAY15d bayonet base, while the 2015-2016 rear position uses the 7443 with a wedge base. These two bulbs share the same 21W/5W dual-filament rating but are not interchangeable due to their different base types.
A shift from single-filament T10 bulbs to dual-filament T20 or bayonet-base bulbs occurs specifically at the rear side marker position, reflecting a functional difference between front and rear marker applications across multiple Impreza generations.
The 7443 and 1157 both carry identical 21W/5W dual-filament ratings at 12V, yet their base configurations, wedge for the 7443 and BAY15d bayonet for the 1157, mean they require different socket types and are not cross-compatible.