Chevrolet C70 Parking Light Bulb Size

Additional Notes

• The 1157 is the dominant parking light bulb across the Chevrolet C70 specifications, appearing in eleven of the twelve model years listed, spanning 1960-1961 and 1979-1988.
• The 1157 is a dual-filament bulb rated at 12V with a 21W high filament and 5W low filament, mounted on a BAY15d bayonet base, and classified under the ANSI standard applicable in the US and Canada.
• The 2057 is specified for the 1983 Chevrolet C70, and it shares the same BAY15d bayonet base as the 1157 while operating at 12V with a higher output of 26.9W and 8W across its two filaments.
• Because both the 1157 and 2057 use the BAY15d bayonet base, the physical mounting interface is the same between the two bulb types, which is a relevant fitment consideration for the 1983 model year.
• Despite the shared base, the 2057 draws more wattage on both filaments than the 1157, meaning the two are not electrically identical and substitution between them warrants attention to the vehicle's socket and circuit ratings.
• Both bulb types carry ANSI standardization, indicating they conform to a defined set of performance and dimensional criteria recognized across the North American market.
• The dual-filament design of both bulbs allows a single unit to serve two lighting functions, which is typical in parking light applications where the same socket may handle both parking and stop or turn signal duties.