Pontiac Grand Safari front turn signal bulbs utilize 1034NA, 1157NA, or 1157 size configurations, while rear turn signal bulbs require 1157 size bulbs. The replacement chart covers 1971 through 1978 production years with corresponding bulb size specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The Pontiac Grand Safari front turn signal uses one of two bulb types across its 1971-1978 model years: the 1034NA or the 1157NA, depending on the specific year.
The rear turn signal position uses the 1157 bulb uniformly across all listed model years, from 1971 through 1978.
All three bulb types found in these specifications, the 1034NA, 1157NA, and 1157, share the BAY15d bayonet base, a double-contact base with two offset pins that prevent incorrect installation orientation.
All three bulb types are dual-filament designs, meaning a single bulb serves two lighting functions, typically combining turn signal and running light or brake light duties within one housing.
The 1034NA is described as a variant of the 1157, operating at 12V with a 21W/5W filament rating and featuring natural amber glass rather than a clear envelope.
The 1157NA shares the same 12V, 21W/5W electrical rating as the 1034NA and also carries natural amber glass, distinguishing both NA-suffix bulbs from the clear 1157.
The natural amber glass on the 1034NA and 1157NA produces amber-colored light without relying on an amber lens, whereas the standard 1157 requires an amber lens or housing to produce the same effect for turn signal use.
All bulb types listed conform to ANSI standards applicable in both the United States and Canada, indicating standardized physical and electrical specifications across North American markets.
The front turn signal of the Grand Safari alternates between the 1034NA and 1157NA across different model years, yet both share the BAY15d base, meaning the socket fitment remains physically compatible despite the bulb designation changing.
The 1157 used in the rear position across all 1971-1978 model years operates at the same 12V, 21W/5W rating as the NA-suffix variants, though it lacks the amber glass coating of those front-position bulbs.