Ford 2003 Mustang Owner's Manual page 84

Seating and safety restraints
To attach the shoulder
belt to the lap belt, pull
the shoulder belt out
from the retractor in
the seatback and insert
into the lap belt
connecting pin into the
wide end of the key
slot on the shoulder
belt. Pull the
connecting pin into the
narrow end of the key
slot until you hear a
snap and feel it latch.
Make sure the shoulder
belt is securely
fastened to the lap belt
by pulling up on the shoulder belt.
Lap belts
Adjusting the lap belt
The lap belt does not adjust automatically.
The lap belts should fit snugly and as low as
possible around the hips, not around the
waist.
Insert the tongue into
the correct buckle (the
buckle closest to the
direction the tongue is
coming from). To
lengthen the belt, turn
the tongue at a right
angle to the belt and
pull across your lap
until it reaches the
buckle. To tighten the
belt, pull the loose end of the belt through the
tongue until it fits snugly across the hips.
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