Mercury 1999 Mountaineer - Manual (Page 138)

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 on the rear edge of the front seat
cushion.
The provision (attaching hole) is provided in the rear edge of the front
passenger seat cushion frame. The anchorbracket 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.
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
138