Fiat 500 Owner's Handbook Manual page 86

The following table, according to European standard ECE 129, indicates the possibility of i-Size child restraint system
installation.
i-Size child restraint
systems
X Seat not suitable for Universal i-Size child restraint systems.
i-U(*) Installation only possible by moving the corresponding front seat forward. In this configuration, the seat must not be occupied.
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i-Size POSITIONS ON THE CAR
Device Front passenger
ISO/R2
ISO/F2
Rear right passenger
X i-U(*)
X i-U(*)
Rear left passenger
X
X