Mercury Mountaineer 2001 - Manual (Page 141)

The rear seats of your vehicle are equipped with built-in tether strap
anchors located behind the seats as described below.
The tether anchors in your vehicle are located in the rear cargo area.
The tether strap anchors in your vehicle are in the following positions
(shown from top view):
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.
1. Position the child safety seat on the rear seat cushion.
2. Route the child safety seat tether strap over the back of the seat.
For vehicles with adjustable head restraints, route the tether strap under
the head restraint and between the head restraint posts, otherwise route
the tether strap over the top of the seatback.
3. Locate the correct anchor for the selected rear seating position.
The anchors must remain accessible. Make sure the anchors are not
covered by the cargo mat or other objects.
Seating and safety restraints
141