Chevrolet 2007 Express 2007 Express Owner's Manual page 58

There are two top tether anchors in the second
row. To install a child restraint in the left outboard
seating position, use anchor point (A). To install
a child restraint in the right outboard seating
position, use anchor point (B). To install a child
restraint in the center seating position, use either
anchor point (A) or (B). Never install two top
tethers using the same top tether anchor.
Second Row — Passenger Van
58
There is a top tether anchor for the center seating
positions in the third and fourth rows, if equipped,
with a three-passenger bench seat. The anchor
is located at the bottom rear of the seat cushion.
Third or Fourth Row — Three Passenger
Bench Seat