When doing replacement or upgrading on 1967 – 1973 Fiat 850, 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 Headlight1967 – 1973 6014
Back Up Light1973 1156
Brake1973 1157
Front Side Marker1973 194
Front Turn Signal1973 1157
License Plate1967 – 1972 89
1973 97
Parking Light1973 1157
Rear Side Marker1973 194
Rear Turn Signal1967 – 1973 1156
Tail Light1973 1157