Oldsmobile Starfire front and rear turn signal bulbs utilize sizes 1034NA, 1157NA, and 1157, with specific bulb configurations varying across model generations. The replacement chart documents bulb size specifications spanning 1954 through 1980 production years.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Oldsmobile Starfire turn signal specifications reference four bulb types across both front and rear positions: 1034, 1034NA, 1157, and 1157NA. All four share the same BAY15d bayonet base and dual-filament construction, operating at 12V with a 21W/5W output rating.
The BAY15d base is a double-contact bayonet fitting with offset pins. The offset pin design prevents incorrect insertion, which is relevant given that all four bulb types in these specifications share this base style.
The dual-filament design in all four bulb types serves two distinct functions within a single housing. The higher-wattage filament (21W) handles the turn signal flash, while the lower-wattage filament (5W) serves a secondary function such as parking or running light duty.
The 1034 and 1034NA are each described as variants of the 1157 and 1157NA respectively. Despite this relationship, the specifications treat them as distinct fitments, and they are not listed interchangeably across model years.
The "NA" suffix on the 1034NA and 1157NA designates natural amber glass. The 1034 and 1157 lack this suffix, indicating clear glass envelopes. In automotive turn signal applications, amber coloring can be achieved either through a colored lens or through an amber-tinted bulb.
For the Oldsmobile Starfire front turn signal, the 1157NA is specified for 1975-1976, 1978-1979, and 1966, while the 1034NA is specified for 1977 and 1980. Substituting one for the other would introduce a mismatch in glass tint relative to the original specification.
The rear turn signal position uses only clear-glass bulb types across all listed years. The 1157 is specified for 1964-1966 and 1975-1980, and the 1034 is specified for 1954-1957 and 1961-1963.
The front and rear turn signal positions share the same bulb type for most years in the 1954-1957 and 1961-1963 ranges, both calling for the 1034. From 1975 onward, the front position shifts between amber-glass variants while the rear consistently uses the clear 1157.
Because the 1034 and 1157 share the BAY15d base, physical installation of either into the same socket is possible. However, the specifications assign them to different model years, and using a non-specified type could affect light output characteristics or lens color balance.
All bulb types listed in these specifications conform to ANSI standards applicable in both the United States and Canada, indicating standardized electrical and physical tolerances across the product range.