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.

• Fiat 131 Bulb Size Guide

1975 – 1978 Fiat 131 Bulb Size Guide
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