Chevrolet 2004 Corvette Owner's Manual page 35

In Canada, the law requires that forward-facing child
restraints have a top strap, and that the strap be
anchored. In the United States, some child restraints
also have a top strap. If your child restraint has a
top strap, it should be anchored.
If your vehicle is a convertible or has a removable roof
panel, do not use a child restraint that requires a
top strap in your vehicle because the strap cannot be
anchored properly.
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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