Ford Econoline/Club Wagon E-150 Owner's Manual page 24

Rear seat shoulder safety belt — stowage (with seat
removed)
When reinstalling a rear seat in your
vehicle it must be placed in its original
position. Improper installation of the seat
will prevent correct use of the safety belts
and could increase the risk of injury.
Refer to the warning label on the seat
belt.
RWARNING
21