FORD 2011 Mustang v.1 - Manual (Page 162)

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.
Once the child safety seat has been
installed, using either the safety
belt, the lower anchors of the LATCH system, or both, you can attach
the top tether strap.
If you install a child seat with rigid LATCH attachments, and have
attached the top tether strap to the proper top tether anchor, do not
tighten the tether strap enough to lift the child seat off the vehicle seat
cushion when the child is seated in it. Keep the tether strap just snug
without lifting the front of the child seat. Keeping the child seat just
touching the vehicle seat gives the best protection in a severe crash.
Perform the following steps to attach a child safety seat to the tether
anchor:
For Coupe only:
1. 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.
2. Locate the correct anchor for the
selected seating position.
Seating and Safety Restraints
162
2011 05+ Mustang (197)
Owners Guide, 1st Printing
USA (fus)