5 on a 4 1/2 front rotor change

As some of us know, that to run a high speed competion car at the 1/4 track, the cars must have a 5 lug bolt through wheel adaption. Well, I have chosen to be Street Pro and stay on the street, but havent had a chance to find any 5 stem rotor/hub assemblies. I have Faimont rotors that work from a pinto, but this is my first 1986 Thunderbird, and it has a four lug set up. I know that ford has always had a better idea but I cant find which Idea to go to for these parts. I sure would like to find a source or option to fix this before I get in head deep. Does anyone have suggestions??? Your Knowledge would be very helpful.