Ford F-250 Owner's Manual page 211

Seating and Safety Restraints
The tether strap anchors in your vehicle are in the following positions
(shown from top view):
• F-Series Regular Cab
• F-Series SuperCab
• F-Series Crew Cab
Attach the tether strap only to the appropriate tether anchor as shown.
The tether strap may not work properly if attached somewhere other
than the correct tether anchor.
211
2012 F-250/350/450/550 (f23)
Owners Guide, 1st Printing
USA (fus)