GMC 2007 Acadia - Manual (Page 65)

The top tether anchors are located at the bottom
rear of the seatback for each seating position
in the second row. 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. The third row has one top tether anchor located at
the bottom rear of the center seatback. This
anchor should be used for the center seating
position only. Never install two top tethers using
the same top tether anchor.
Do not secure a child restraint in the right front
passenger position or the third row outboard
seating positions, 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 these positions.
Second Row — Bucket Shown, Bench Similar Third Row Seat
65