The Pontiac Tempest front turn signal bulb accommodates 3 distinct sizes including 1034NA and 1157NA, while the rear turn signal bulb size includes 1157 and 1034. The replacement chart covers 1961 through 1970 vehicle production years with corresponding bulb specifications.
The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.
The 1157 and 1034 bulb families are the two types used across all front and rear turn signal positions on the Pontiac Tempest throughout its 1961-1970 model years.
All four bulb types in these specifications share the BAY15d bayonet base and a 12V, 21/5W dual-filament configuration, meaning each bulb carries one filament for steady running light duty and a second, brighter filament for the turn signal function.
The 1034 is classified as a variant of the 1157, and the 1034NA is similarly a variant of the 1157NA. Both variant types operate at the same voltage and wattage as their parent bulbs.
The "NA" suffix on the 1034NA and 1157NA designates natural amber glass, which produces an amber signal output directly from the bulb rather than relying on a colored lens to filter a clear light source.
The front turn signal on the Pontiac Tempest used the 1034NA for 1969-1970, the 1157NA for 1966-1968, the 1034NA again for 1965, the 1157 for 1964, the 1034NA for 1963, and the clear-glass 1034 for 1961-1962.
The rear turn signal used the 1157 from 1964-1970 and the 1034 from 1961-1963, reflecting a shift to the parent bulb type at the rear position beginning in 1964.
Because the 1034 and 1157 families share the BAY15d base and identical voltage and wattage ratings, physical fitment into the same socket is possible, though substitution between amber-glass and clear-glass variants would affect the color output at the lens.
The front and rear turn signal positions do not always share the same bulb type within a given model year. For 1963, the front used the 1034NA while the rear used the 1034, and for 1964, the front used the 1157 while the rear also used the 1157, making that year one of the few with a matching front-to-rear specification.