Pontiac 2003 Montana Owner's Manual page 72

Lower Anchorages and Top Tethers
for Children (LATCH System)
Your vehicle has the LATCH system. You'll find
anchors (A) in the second row outboard bucket seats,
the 40 side of the 60/40 split bench seat and both
second row captain's chairs.
To assist you in locating the lower anchors for this child
restraint system, each seating position with the
LATCH system will have latches between the seatback
and cushion.
1-66
In order to use the system, you need either a
forward-facing child restraint that has attaching points
(B) at its base and a top tether anchor (C), or a
rear-facing child restraint that has attaching points (B),
as shown here.