When doing replacement or upgrading on 1974 – 1983 Fiat X-1/9, 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 Headlight1974 – 1983 6014
Back Up Light1980 1073
1974 – 1979 1156
Brake1981 – 1983 1156
1974 – 1980 1157
Front Side Marker1974 – 1979, 1981 – 1983 194
1980 57
Front Turn Signal1974 – 1983 1157
License Plate1979, 1981 – 1983 67
1974 – 1978, 1980 89
Parking Light1974 – 1983 1157
Rear Side Marker1974 – 1979, 1981 – 1983 194
1980 57
Rear Turn Signal1974 – 1983 1156
Tail Light1974 – 1980 1157
1981 – 1983 67