Buick 2002 LeSabre Owner's Manual page 52

In order to use the system, you need either a
-
forward facing child restraint that has attaching
points (B) at its base and a top tether anchor (C), or a
-
rear facing child restraint that has attaching points (B),
as shown here.
1-46
With this system, use the LATCH system instead of the
vehicle's safety belts to secure a child restraint.