The Austin America front and rear turn signal bulbs both utilize a 1034 bulb size. The replacement chart covers vehicle production spanning 1968 to 1972.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1034 bulb is an ANSI-standard dual-filament bulb rated at 12 volts with a 21/5 watt output, mounted on a BAY15d bayonet base.
A dual-filament design means the 1034 operates two separate filaments within a single envelope, allowing it to serve both a brighter signaling function and a dimmer running or parking function simultaneously.
The BAY15d bayonet base features two offset pins, which physically prevents incorrect insertion of single-filament bulbs into a dual-filament socket.
The 1034 is described as a variant of the 1157, a widely used automotive bulb, though the two are not confirmed as interchangeable within these specifications.
The Austin America uses the 1034 bulb for both front and rear turn signal positions across the full 1968-1972 model range.
The uniform application of a single bulb type across all positions and all listed model years indicates no mid-cycle changes were made to the turn signal bulb specification for this vehicle.
The 1034 carries ANSI standardization applicable in both the United States and Canada, meaning it conforms to a defined set of electrical and physical criteria recognized across North American markets.