Opel Owner's Manual page 73

Remove rear outer head restraints
and push centre head restraint all the
way down 3 47. Stow the removed
head restraints in the cavity below the
raised seat cushions.
Disengage backrest (one-piece or
split) using release button, fold
forward and engage.
Storage
Folding down centre backrests
Push head restraint down as far as
possible 3 47. Disengage backrest
using lever and fold onto seat
cushion. If the seat cushion is raised,
fold it forward until it engages.
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