Ford F-650 2001 Owner's Manual page 101

Tether anchorage hardware
A tethered seat can be installed in the front seat. Put the tether strap
over the seatback and attach it to an anchor bracket.
An anchor bracket can be installed to the inside of the back panel of
your vehicle.
The anchor bracket must be installed using the instructions provided
with the tether anchorage hardware kit.
Tether anchorage hardware kits (part number 613D74) including
instructions, may be obtained at no charge from any Ford or
Lincoln/Mercury dealer.
If you have a Super Cab or Crew Cab, Ford recommends you attach
tether safety seats in the rear seating position (if possible) with the
tether strap attached to the tether anchorage bracket as shown in the
instructions provided with the tether anchor kit.
Tighten the anchor according to specifications. Otherwise, the
safety seat may not be properly secured and the child may be
injured in a sudden stop or collision.
Seating and safety restraints
101