Top Strap Anchor Location - GMC 2004 Yukon XL Owner's Manual

If you have an adjustable head restraint, route the top
strap under it.
CAUTION:
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Each top tether bracket is designed to anchor
only one child restraint. Attaching more than
one child restraint to a single bracket could
cause the anchor to come loose or even break
during a crash. A child or others could be
injured if this happens. To help prevent injury
to people and damage to your vehicle, attach
only one child restraint per bracket.
Once you have the top strap anchored, you will be
ready to secure the child restraint itself. Tighten the top
strap when and as the child restraint manufacturer's
instructions say.
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Top Strap Anchor Location

Yukon/Yukon XL models with rear seats: A child
restraint with a top strap should only be used in
the second or third row. Don't use a child restraint with
a top strap in the front seat because there's no place
to anchor the top strap.
Do not secure a child restraint with a top strap in the
right front passenger's position or in the third row driver's
side position if a national or local law requires that the
top strap be anchored, or if the instructions that
come with the child restraint say that the top strap must
be anchored. There is no place to anchor the top
strap in these positions.
An anchor loop bracket for a top strap is located at
the bottom rear of the seat cushion for each seating
position in the second row, and for the center seating
position in the third row.