F 350 4WD Super Duty V8-6.4L DSL Turbo (2008)
Child Seat: Description and Operation
ATTACHING SAFETY SEATS WITH TETHER STRAPS
Some manufacturers make child safety seats that include a tether strap that goes over the back of the vehicle seat and attaches to an anchoring point.
Other manufacturers offer the tether strap as an accessory. Contact the manufacturer of the child safety seat for information about ordering a tether strap.