Hummer H2 2010 Owner's Manual page 92

Second Row
For SUV models with a second row 60/40 bench seat,
the top tether anchors are located at the bottom rear of
the seat cushion for each position in the second row. Be
sure to use the anchor located nearest to the seating
position where the child restraint will be placed.
2-54
SUV 60/40 Bench Second Row
For SUT models with a second row 60/40 bench seat,
the top tether anchor is located at the bottom rear of the
seat cushion for the center position in the second row.
You may need to fold the seatback of the passenger
side seat forward in order to access this anchor.
SUT 60/40 Bench