Porsche 914 front turn signal bulbs measure 1157 in size, while rear turn signal bulbs measure 1156, with each bulb size corresponding to specific lighting functions on the vehicle. The replacement chart covers 1970 through 1976 production years and details bulb size specifications for turn signal applications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Porsche 914 uses the 1157 bulb for the front turn signal across its entire production run of 1970-1976.
The 1157 is a dual-filament bulb, meaning it serves two lighting functions within a single housing, operating at 12V with filaments rated at 21W and 5W respectively.
The 1157 uses a BAY15d bayonet base, which features two offset pins at different heights to prevent incorrect installation of the bulb.
The rear turn signal on the Porsche 914 uses the 1156 bulb across all model years from 1970-1976.
The 1156 is a single-filament bulb rated at 12V and 21W, with a BA15s bayonet base that has two pins at equal heights.
Although the 1157 and 1156 share a similar bayonet-style base, their pin configurations differ, making them non-interchangeable despite their similar appearance.
Both the 1157 and 1156 are ANSI-standardized bulbs recognized in the United States and Canada, meaning physical and electrical specifications are consistent across manufacturers producing these part numbers.
The front and rear turn signals on the 914 intentionally use different bulb types, reflecting a design distinction between a dual-function front position and a dedicated single-function rear signal.