Vauxhall KTA-2683/6-VX-en Owner's Manual page 39

38 Seats, restraints
Suspension seat backrests
Pull lever, adjust inclination and
release lever. Allow the seat to
engage audibly.
Seat height
Lever pumping motion
up = seat higher
down = seat lower
Suspension seat height
Pull up front release lever up to adjust
height of front part of seat.
Pull up rear release lever to adjust
height of rear part of seat.