This 1157 socket pigtail uses a two filament light bulb commonly used in brake light, turn signal and tail light applications.
Pigtail measures 10"
Reported to fit these Buick vehicles:
Electra 1959-68
Estate Wagon 1960-75
Invicta 1959-63
LeSabre 1959-75
Regal 1973-75
Riviera 1963-75
Wildcat 1962-70