trying to get info on mustang roters

hi and thanks for looking a little while back there was a piece on useing mustang roters on a 71 duster 4 piston caliper set up to convert it to a 4 1/2 bolt patern from 4 inch .... there was a few changes to be made to the roters .... so i'm trying to find out what they are is there anyone out there with that info ..... please :) thanks for your help

Pat