Opel Astra 2013 Owner's Manual page 61

Permissible options for fitting an ISOFIX child restraint system
Weight class Size class Fixture
Group 0: up to 10 kg E
Group 0+: up to 13 kg E
D
C
Group I: 9 to 18 kg D
C
B
B1
A
IL = Suitable for particular ISOFIX restraint systems of the 'specific-vehicle', 'restricted' or 'semi-universal' categories.
The ISOFIX restraint system must be approved for the specific vehicle type.
IUF = Suitable for ISOFIX forward-facing child restraint systems of universal category approved for use in this weight class.
X = No ISOFIX child restraint system approved in this weight class.
On front passenger seat
ISO/R1 X
ISO/R1 X
ISO/R2 X
ISO/R3 X
ISO/R2 X
ISO/R3 X
ISO/F2 X
ISO/F2X X
ISO/F3 X
Seats, restraints
On rear outboard seats
IL
IL
IL
IL
IL
IL
IL, IUF
IL, IUF
IL, IUF
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On rear centre seat
X
X
X
X
X
X
X
X
X