blackbirds custom trucks in washington makes dually kits.... thay arent cheap... I had one of his first ones... it used late model rotors... I went thru some fit and finsh stuff with him but he worked it all out... nice kit...
I talked with shawn at great lakes offroad... he can sell you brackets and spacers... this is the way i would go (and will) with my next dually project.... it might be a little effort to get it all to work but youll save 3-400...
cam