it used to be a "standard" that GM and Ford bolt patterns were NOT able to be crossed. Now things could have changed, but I dont know. The BEST thing to do is drive to a car shop that can order wheels, hell, i think Pep Boys will even have a book on it, and have them check the bolt patterns, thats the first step, then you might wanna hit up a Lightning owner from this board if they are compatible and see what the backspacing is and go from there.
Hope that helps.