Buick Lucerne 2007 Owner's Manual page 58

The top tether anchors are located under the trim
covers on the rear seatback filler panel. Flip
open the trim cover to access the anchors. Be
sure to use an anchor located on the same side of
the vehicle as the seating position where the
child restraint will be placed.
58
Do not secure a child restraint in the right front
passenger's position if a national or local law
requires that the top tether be attached, or if the
instructions that come with the child restraint
say that the top tether must be attached. There is
no place to attach the top tether in this position.
Accident statistics show that children are safer
if they are restrained in the rear rather than
the front seat. See Where to Put the Restraint on
page 53 for additional information.