Buick Regal Owner's Manual page 72

3-18 Seats and Restraints
Sewn in Safety Belt Comfort
Guide
On vehicles with the sewn in
comfort guide, there is one guide for
each outboard passenger position in
the rear seat.
To install a comfort guide to the
safety belt:
1. Remove the guide from its
storage pocket on the side of
the seat.
2. Place the guide over the belt,
and insert the two edges of the
belt into the slots of the guide.
3. Be sure that the belt is not
twisted and it lies flat. The
elastic cord must be under the
belt and the guide on top.