Opel COMBO Owner's Manual page 72

70 Seats, restraints
ISOFIX size class and seat device
A – ISO/F3 : forward-facing child restraint system for children of maximum size in the weight class 9 to 18 kg
B – ISO/F2 : forward-facing child restraint system for smaller children in the weight class 9 to 18 kg
B1 – ISO/F2X : forward-facing child restraint system for smaller children in the weight class 9 to 18 kg
C – ISO/R3 : rear-facing child restraint system for children of maximum size in the weight class up to 18 kg
D – ISO/R2 : rear-facing child restraint system for smaller children in the weight class up to 18 kg
E – ISO/R1 : rear-facing child restraint system for young children in the weight class up to 13 kg
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 X
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 On the seats in the second row On the seats in the third row
i - U X