I have something that i found that ill share with yall....Its a web site that gives you steps on how to change to rear disc and what parts to use. i have not went through the steps on my truck yet but from this does not sound tooo bad, I just need to get me the mounting plates or templets so i can make my own brakets. here yall go guys hope it helps.
http://www.coloradok5.com/atrondiskbrakes.shtml
Eric