FORD 2004 Crown Victoria v.1 - Manual (Page 125)

Never attach two LATCH child safety seats to the same anchor.
In a crash, one anchor may not be strong enough to hold two
child safety seat attachments and may break, causing serious injury or
death.
The lower anchors for child seat installation are located at the rear
section of the rear seat between the cushion and seat back. The inboard
LATCH anchors are located below the locator symbols on the seat back.
The outboard LATCH anchors are 11 inches (280 mm) outboard of the
locator symbols, behind the matching slits in the bottom edge of the seat
back.
2004 Crown Victoria (cro)
Owners Guide (post-2002-fmt)
USA English (fus)
Seating and Safety Restraints
125