Chevrolet 2003 Silverado 1500 Pickup Owner's Manual page 51

If your vehicle is a regular cab model, there is also a
top strap anchor for the right front passenger position
located on the back panel of your vehicle, behind
the right front passenger seat. In order to get to the
anchor, you'll have to remove the trim plug covering it.
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.
Rear Seat Top Strap Anchors
(Extended Cab Models)
If your vehicle is an extended cab model, you'll find the
top strap anchors for the rear seating positions near
the top of the seatback. In addition to the top strap
anchors, each seating position has a fabric loop at the
top of the seatback that you'll use to route a top
strap through.
1-44