Chevrolet Cavalier Turn Signal Bulb Size

Additional Notes

• The Chevrolet Cavalier front turn signal uses three distinct bulb types across its production span: the 2057/2057NA family with a BAY15d bayonet base, the 3357 wedge type, and the 3457 wedge type, reflecting housing design changes over the years.
• The 3457 and 3057 are both dual-filament T25 wedge bulbs rated at 12V with a 27W high filament and 7W low filament. The 3457 appears in the front position and the 3057 in the rear for the 2000-2005 model years, and while their wattage ratings match, they are not the same part and are not listed as interchangeable in these specifications.
• The 3357, used in the Cavalier front turn signal for 2000-2002, is a single-filament T25 wedge bulb rated at 12V and 27W. It shares the same T25 wedge form factor as the 3457 but lacks a second filament, which makes the two types electrically distinct despite their physical similarity.
• The 2057 and 2057NA are dual-filament bulbs with a BAY15d bayonet base, rated at 12V, 26.9W/8W. Both are described as brighter variants of the 1157, and the only difference between them is that the 2057NA has natural amber glass, which produces an amber output without a separate amber lens.
• The 2357NA shares the same BAY15d bayonet base and 12V, 26.9W/8W rating as the 2057NA. It is used in the Cavalier front turn signal for 1993-1994, directly following years that used the 2057NA, indicating a specification change between 1992 and 1993 despite identical electrical ratings.
• The 1034NA, used in the 1982 Cavalier front turn signal, is a dual-filament BAY15d bayonet bulb rated at 12V, 21W/5W. Its wattage output is lower than the 2057 family, and its natural amber glass distinguishes it visually from clear-glass variants in the same base family.
• The 1156, used in the Cavalier rear turn signal for 1982-1984 and again in 1986, is a single-filament bulb with a BA15s bayonet base rated at 12V and 21W. The BA15s base is not compatible with the BAY15d base used by the 2057 family, making these two groups non-interchangeable even though both use bayonet-style connections.
• The rear turn signal for the Chevrolet Cavalier used the 2057 bulb continuously from 1987 through 1994 and again from 2000 through 2005 with the 3057, representing two extended periods of specification consistency across different housing generations.
• The "NA" suffix in bulb designations such as 2057NA, 2357NA, and 1034NA indicates natural amber glass. This coloring is built into the glass envelope itself, meaning the bulb produces amber light independently of the lens color of the housing it is installed in.
• The front and rear turn signal positions on the Cavalier do not share the same bulb type in any listed year, even when the wattage ratings are close. For example, the 3457 (front, 2003-2005) and the 3057 (rear, 2003-2005) have identical voltage and wattage ratings but carry different part numbers and are specified separately for each position.