Ford Mustang Owner's Manual page 123

4. (Convertible only). Place the shoulder belt in
the belt holder at the top of the seatback and
place the lap belt in the belt guide at the
side of the seat cushion. The retracted belt
should be stored on this holder and in the
belt guide when not in use, except when a
passenger is entering or leaving the rear seat
area of the vehicle.
Belt holder location — convertible only
The shoulder belt must always be in the
belt holder when the belt is in use.
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