Chevrolet 2003 Venture Owner's Manual page 75

Third Row
An anchor bar for a top strap is located at the rear of
the seat cushion for each second and third row outboard
seating position, and for the center position of the
second row.
1-68
Third Row (Stowable Seat)
The anchor bar for the stowable bench seat
is
located
on the passenger's side of the crossbar. Use the center
seating position to use the anchor bar properly. If the
convenience center is in the vehicle, you must lift
the tray sill to use the anchor.