Mercedes-Benz G 55 AMG Operator's Manual page 47

Getting started
Driving
Fastening the rear center seat belt
Pull both latch plates 1 and 2 out of
the attachment ( page 45).
The seat belt has two latch plates:
Plate 1 is fixed at the end of the belt.
Latch plate 2 is free-sliding across the
belt.
With a smooth motion, pull the belt
from the belt outlet.
46
Push fixed latch plate 1 into
buckle 3 until it clicks.
Guide the seat belt at free-sliding latch
plate 2 across your body.
Place the shoulder portion of the belt
across the top of your shoulder and the
lap portion across your hips.
Push free-sliding latch plate 2 into
buckle 4 until it clicks.
If necessary, tighten the lap portion to
a snug fit by pulling shoulder portion
up.