GMC 2001 Sierra 1500 Pickup Owner's Manual page 60

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A forward facing child seat (C
for the child's body with the harness and also sometimes
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with surfaces such as T shaped or shelf
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E) provides restraint
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like shields.
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A booster seat (F G) is a child restraint designed to
improve the fit of the vehicle's safety belt system.
Some booster seats have a shoulder belt positioner,
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and some high back booster seats have a five
harness. A booster seat can also help a child to see out
the window.
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point
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