i did it in mine myself.

the cable is neatly tucked next to one of the metal tubes into the plastic fascia.

check out the pictures:





a company called Vizualogic makes a headrest with a hidden cable but its shape was not the same as the sport seats on my '03 4.6.

its easy to do.

check out the FAQ on the front board.

you must take the back of the seat off to do this properly and you will need two of the appropriate fasteners on either side.

its a great mod. the vizualogic headrests did not exactly match the color and shape of the leather/backrest; besides, i used sony hi def widescreen monitors which also have a built in infrared transmitter and have two audio and video inputs so that each user can watch their own channel (TV versus the second input).....

jeff and i did in one sunday morning. took a few hours. its easier to do than you think.

check out this example of install instructions (almost exactly how we did it) here