Ford Mercury Villager 1997 Owner's Manual page 137

Seating and Safety Restraints
Fastening the rear seat combination lap and shoulder belt
To tighten the lap portion of the belt, pull up on the shoulder belt
until it fits you snugly. The belt should rest as low on your
hips as possible.
The passenger seated near the sliding door in the three-passenger
bench seat can route the safety belt webbing under the guide
located on the head restraint. This safety belt guide is designed to
help keep the safety belt webbing properly positioned across
the passenger's chest for maximum comfort. This guide is only
needed when the two-passenger second row bench seat is removed
and the three-passenger bench seat is moved up to the
second-row position.
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