FORD 1998 Expedition - Manual (Page 99)

Tether anchorage hardware
A tethered seat can be installed in the front passenger seat. Put the
tether strap over the seatback and attach it to an anchor bracket.
Anchor brackets can be bolted to the rear edge of the front passenger
seat cushion. The bolt holes are in the bottom of the rear edge of the
front passenger seat cushion frame. The anchor bracket must be
installed using the instructions provided with the kit.
Tether anchorage hardware kits (part number 613D74) including
instructions, may be obtained at no charge from any Ford or
Lincoln-Mercury dealer.
Tether anchor brackets may also be installed to the floor behind the
second row seats.
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
99