Hummer 2003 H2 Owner's Manual page 65

Lower Anchorages and Top Tethers for
Children (LATCH System)
Your vehicle has the LATCH system. You'll find
anchors (A) in the outboard positions for the second row
seats where the seatback meets the seat cushion.
To assist you in locating the lower anchors for this child
restraint system, each seating position with the LATCH
system will have a visible metal anchorage point in the
seat, where the seatback meets the seat cushion.
Third Row Seat
1-59