Opel ASTRA Owner's Manual page 67

F– ISO/L1 : left lateral facing position child restraint system (carry-cot)
G – ISO/L2 : right lateral facing position child restraint system (carry-cot)
Permissible options for fitting an i-Size child restraint system with ISOFIX brackets
i-Size child restraint systems
i - U : suitable for i-Size 'universal' forward and rearward facing child restraint systems
X : seating position not suitable for i-Size 'universal' child restraint systems
On front passenger seat
activated airbag deactivated airbag
X X
Seats, restraints
On rear outboard seats
i - U
65
On rear centre seat
X