When doing replacement or upgrading on 1975 - 1978 Fiat 131, the bulb size guide is necessary for you to take the reference.
Jump to corresponding car model with the catalog bellow.
Low Beam Headlight 1975 - 1978 H5006
High Beam Headlight 1975 - 1978 H5001
Back Up Light 1975 - 1978 1156
Brake 1975 - 1977 1156
1978 1157
Front Side Marker 1975 - 1978 194
Front Turn Signal 1975 - 1978 1157
License Plate 1976 - 1978 97
Parking Light 1975 - 1978 1157
Rear Side Marker 1975 - 1978 194
Rear Turn Signal 1975 - 1978 1156
Tail Light 1978 1157
1975 - 1977 97