When doing replacement or upgrading on 1976 - 1979 Buick Opel, the bulb size guide is necessary for you to take the reference.
Jump to corresponding car model with the catalog bellow.
High Beam and Low Beam Headlight 1976 - 1978 6014
1979 H6054
Brake 1976 - 1979 1157
Dome Light 1976 - 1978 57
1979 67
Front Side Marker 1976 - 1979 67
Front Turn Signal 1976 - 1979 1157
License Plate 1979 53
1976 - 1978 67
Parking Light 1976 - 1979 1157
Rear Side Marker 1976 - 1979 67
Rear Turn Signal 1976 - 1979 1157
Tail Light 1976 - 1979 1157