Chevrolet 2001 Silverado 1500 Pickup Owner's Manual page 65

Right Front Passenger Position Top Strap
Anchor (All Models)
You'll find the top strap anchor for the right front
passenger seat behind the seat, near the floor.
1-52
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.