FORD 2009 F-550 v.1 - Manual (Page 190)

Use only extensions manufactured by the same supplier as the safety
belt. Manufacturer identification is located at the end of the webbing on
the label. Also, use the safety belt extension only if the safety belt is too
short for you when fully extended.
WARNING: Do not use extensions to change the fit of the
shoulder belt across the torso.
AIRBAG SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
Important SRS precautions
The SRS is designed to work with
the safety belt to help protect the
driver and right front passenger
from certain upper body injuries.
Airbags DO NOT inflate slowly;
there is a risk of injury from a
deploying airbag.
WARNING: All occupants of the vehicle, including the driver,
should always properly wear their safety belts, even when an air
bag supplemental restraint system (SRS) is provided.
2009 F-250/350/450/550 (f23)
Owners Guide, 1st Printing
USA (fus)
Seating and Safety Restraints
190