Ford 2003 Mustang Owner's Manual page 86

Seating and safety restraints
The lap belts should fit snugly and as low as
possible around the hips, not around the
waist.
Front and rear seat occupants, including
pregnant women, should wear safety belts
for optimum protection in an accident.
Each seating position in your vehicle has a
specific safety belt assembly which is made
up of one buckle and one tongue that are designed
to be used as a pair. 1) Use the shoulder belt on
the outside shoulder only. Never wear the shoulder
belt under the arm. 2) Never swing the safety belt
around your neck over the inside shoulder. 3)
Never use a single belt for more than one person.
Due to folding rear seats, sometimes the buckles and
tongues toward the center of the vehicle may be
hidden by the rear edge of the seat cushion. Pull
them out so they will be accessible.
While you are fastened in the seat belt, the shoulder
belt adjusts to your movement. However, if you
brake hard, turn hard or your vehicle receives an
impact of 8 km/h (5 mph) or more, the safety belt
will become locked and help reduce your forward
movement.
To unfasten the belt, push the red release button on
the end of the buckle. This allows the tongue to
unlatch from the buckle. While the belt retracts,
guide the tongue to its original position to prevent it
from striking you or the vehicle.
Safety belt extension assembly
If the safety belt assembly is too short, even when
fully extended, 20 cm (8 inches) can be added to
the safety belt assembly by adding a safety belt
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