The Subaru SVX front turn signal bulb size measures 1157NA or 1034NA, while the rear turn signal bulb size measures 1156. The replacement chart covers 1992 to 1997 model years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Subaru SVX front turn signal position uses two different bulb types across its production run, alternating between the 1157NA and 1034NA depending on the model year.
The 1157NA bulb is specified for the front turn signal on the Subaru SVX in 1993, 1995, and 1997, while the 1034NA is specified for 1992, 1994, and 1996.
Both the 1157NA and 1034NA are dual-filament bulbs rated at 12V with a 21W/5W output, sharing the BAY15d bayonet base and natural amber glass construction.
The 1034NA is classified as a variant of the 1157NA, meaning the two share closely related electrical and physical characteristics despite carrying different ANSI designations.
Natural amber glass, as present in both the 1157NA and 1034NA, produces the amber turn signal color directly from the bulb rather than relying on a colored lens to filter a clear light source.
The rear turn signal on the Subaru SVX uses the 1156 bulb across all model years from 1992-1997, making it the only position with a consistent specification throughout the entire production span covered.
The 1156 is a single-filament bulb rated at 12V and 21W, fitted with a BA15s bayonet base, which is not interchangeable with the BAY15d base found on the 1157NA and 1034NA.
The BA15s base on the 1156 has a single locating pin, whereas the BAY15d base on the dual-filament bulbs has two offset pins. This physical difference prevents cross-position substitution between front and rear turn signal bulbs on the SVX.
All three bulb types in these specifications conform to ANSI standards applicable to the US and Canadian markets.
The dual-filament design of the front turn signal bulbs allows a single housing to serve two lighting functions, with the 21W filament typically assigned to the turn signal and the 5W filament to a secondary function such as a parking or running light.