PEUGEOT 4008 Online Manual page 170

Safety
these child seats can also be used on seats which are not fitted with ISOFIX mountings.
In this case, they must be attached to the vehicle seat using the three point seat belt.
Follow the instructions for fitting the child seat given in the seat manufacturer's installation guide.
168
Group 1: from 9 to 18 kg
IL3
RÖMER Duo Plus ISOFIX
Attached to the rings A, as well as ring B,
known as the tOP tetHeR, using an upper strap.
3 angled positions for the shell.
IL4
FAIR G 0/1 S and its ISOFIX FWF base
Installed in the rearward facing position using an ISOFIX base, which is attached to the rings A.
6 angled positions for the shell.
this configuration is suitable for children weighing more than 13 kg.
Installed forward facing.
the base has a support leg.