Chevrolet 2007 Express 2007 Express Owner's Manual page 16

3. Insert the locking pin into the seat base and
push the seat to line up with the pin with the
base. The pin with the black cap marked "R"
must be installed on the passenger's side and
the pin with the gray cap marked "L" on the
driver's side.
4. Push the pin with the black cap marked "R"
down until it is in the retaining clip.
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5. Push the pin with the gray cap marked "L"
down until it is 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.