Buick 1998 Century Owner's Manual page 46

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Which slots should I use for my child?
A:
With the child seated on the child restraint cushion,
use the pair of slots that is at or just above the top
of the child's shoulders.
With this built-in child restraint, you can adjust the
height of the harness. Depending on the seated height
of the child, you can route it through the upper pair of
slots (A), the middle pair
of
slots (B) or the lower pair
of slots (C).
For the child shown here, the harness should go through
the middle pair of slots (B).
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