Chevrolet 2004 Silverado 1500 Pickup Owner's Manual page 53

If your vehicle is a Crew Cab model, you'll find top strap
anchors for the rear seating positions located on the
back panel of your vehicle, behind the rear seat.
In order to get to the brackets, you'll have to remove the
trim plugs covering them.
There are also anchorage points at the rear base of the
front passenger's seat.
Lower Anchorages and Top Tethers
for Children (LATCH System)
Your vehicle has the LATCH system. You will find
anchors (A) for the front passenger and the center rear
seating positions for extended cab models. For
regular cab models, you will find anchors for the right
front passenger seating position. For crew cab models,
you will find anchors for the second row center and
second row right passenger seating positions.
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