Im confused

[Afrancis]

Well i thought my 05 FX4 was prewired for the rail dvd player since I found a plug in the hole above the headliner, and one behind the radio. But then I seen these instructions on brandmotion, and now I think it might be prewired for the bluetooth. Am I missing something here?
http://www.brandmotion.com/pdf/Pre-wired_Railport%20Installation.pdf
http://www.brandmotion.com/manuals/F150_DVD_Install_Instructions.pdf

[fil98]

i have an 08 lariat,with sat. radio.i installed the brandmotion,its plug and play.