Buick Regal 2011 Owner's Manual page 70

3-24 Seats and Restraints
To install the adjustable safety belt
comfort guide to the seatback and
the safety belt:
1. Locate the anchorage loop
between the rear outboard
seatback and seat bolster, near
the top.
2. Attach the adjustable comfort
guide to the anchor loop by
threading the hook through
the loop.
3. Place the guide over the belt,
and insert the two edges of the
belt into the slots of the guide.