I did this last summer but was too lazy to get pics up until I read the other thread inquiring about this. What I did was order black Mazda 3 headrests because they are a little bigger than the 5 headrests, so I was able to put the size of monitors in that I wanted (I think they're 7 inch IIRC). I ran the wire down the back of the seat to, under the carpet and to the glovebox, where the dvd player fir PERFECTLY! It wasn't too hard to do at all
(notice you can't see the wire with the headrest down)
(the wire with the headrest raised)
(notice you can't see the wire with the headrest down)
(the wire with the headrest raised)