Chevrolet 2008 Express Owner's Manual page 13

Three Passenger Seat Shown
4. Push the pin(s) marked "R" down until they are in
the retaining clip.
Three Passenger Seat Shown
5. Push the pin(s) marked "L" down until they are in
the retaining clip.
6. If the vehicle has a floor mat, put the flap back to
its original position.
7. Repeat this procedure for the other seat base.
8. Connect the quick-release latch plates for the
lap-shoulder belts by inserting the latch plates
into the buckles attached at the outboard positions
of the bench seat. Do not twist the belt.
9. Check that all locking pins are locked into place
before operating the vehicle.
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