Ford Mustang Owner's Manual page 122

2. While the belt retracts, guide the tongue to
its stowed position. If you do not guide the
tongue, it may strike you or part of the
vehicle.
3. (Coupe only). Place the belt in the belt
holder at the top of the seatback. The
retracted belt should be stored on this holder
when not in use, except when a passenger is
entering or leaving the rear seat area of the
vehicle.
Belt holder location — coupe only
121