Chevrolet 2003 Monte Carlo Owner's Manual page 47

Once you have the top strap anchored, you'll be ready
to secure the child restraint itself. Tighten the top
strap when and as the child restraint manufacturer's
instructions say.
Top Strap Anchor Location
Your vehicle has top strap anchors already installed for
the rear seating positions. You'll find them behind
the rear seat on the filler panel.
Lower Anchorages and Top Tethers
for Children (LATCH System)
Your vehicle has the LATCH system. You'll find
anchors (A) in all three rear seating positions.
U
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.
1-40