Chevrolet 2009 Suburban Owner's Manual page 55

There is one guide for each outside passenger position
in the second row seat and the third row, if the vehicle
has one. Here is how to install a comfort guide to the
safety belt:
Second Row
1. For the second row, remove the guide from its
storage clip on the interior body.
Third Row
If your vehicle has a third row, remove the guide
from its storage pocket on the side of the seat.
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