Austin Healey Sprite front turn signal bulbs measure 1034 in size, while rear turn signal bulbs measure P21W or 1073, with these bulb sizes specified for the vehicle. The replacement chart covers 1958 to 1970 production years and contains bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1034 bulb is the sole front turn signal bulb specified for the Austin Healey Sprite across all listed model years, spanning 1958-1970.
The 1034 is a dual-filament bulb operating at 12V with a 21/5W output, built to the ANSI standard used in the United States and Canada, and fitted with a BAY15d bayonet base.
As a variant of the 1157, the 1034 shares the same BAY15d base and dual-filament design but differs in its specific wattage output.
The BAY15d base on the 1034 is an offset-pin bayonet fitting, which prevents accidental installation of single-filament bulbs into dual-filament sockets.
Rear turn signal specifications for the Sprite differ by year. The 1967 model uses the 1073, while the 1968-1970 models use the P21W.
The P21W is a single-filament bulb rated at 12V and 21W, conforming to the ECE standard used in Europe and worldwide, and fitted with a BA15s bayonet base.
The 1073 is also a single-filament bulb with a BA15s bayonet base, but it operates at a lower 13W output and conforms to the ANSI standard rather than the ECE standard.
Although the P21W and the 1073 share the same BA15s bayonet base, their differing regulatory standards and wattage ratings mean they are not confirmed interchangeable replacements for one another in these specifications.
The front and rear turn signal sockets on the Sprite are not interchangeable, as the front uses the dual-filament BAY15d base of the 1034, while the rear uses the single-filament BA15s base of either the P21W or the 1073.