Buick 2007 Rendezvous Owner's Manual page 74

Second Row Center Position Bench Seat with
Third Row Seat
If the vehicle has a third row seat and the seatback
is upright, there is an anchor strap located
between the third row seatback and cushion to
anchor the child restraint for the second row center
position bench seat.
74
Second Row Center Position Bench Seat with
Third Row Seat Folded Down
If the vehicle has a third row seat and the seatback
is folded down, there is an anchor on the back
of the third row seat for the second row center
position bench seat.
If you are using a child restraint with a top tether in
the second row center bench seat and need to
temporarily transport a flat tire for repair, move the
child restraint to a rear seat outboard position.