Ford 1998 Mustang Owner's Manual page 80

Seating and safety restraints
Installing child safety seats in combination lap
and shoulder belt seating positions
1. Position the child
safety seat in a seat
with a combination lap
and shoulder belt.
An air bag can kill or injure a child in a child
seat. If you must use a forward-facing child
seat in the front seat, move seat all the way back.
Children 12 and under should be properly
restrained in the rear seat whenever
possible.
2. Pull down on the
shoulder belt and then
grasp the shoulder belt
and lap belt together.
3. While holding the
shoulder and lap belt
portions together, route
the tongue through the
child seat according to
the child seat
manufacturer's
instructions. Be sure
the belt webbing is not
twisted.
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