Front headrests

[A8 Owner]

First thing is,
1/are pre face lift and face lift front headrests the same? ( black sport seats)
2/ How do they come out/work, ive tryed pulling gently?
3/ how/can u run cables down inside seat?

You possibly guessed what im upto LOL. Looking to put some sort of screens in back of headrests or buy some already done. I know theres loads on Fle bay, some good some bad. I know they say they will fit any car as there adjustable, but do u need to put Audi 1's in a A8 as there electric?

thanks for any help Mel ( Another project while steves away)