WHat disc conversion kit to use????

I just received my summit rear disc brake setup,,,, 485$ with shipping to me. I'm looking into using a 95 grand cherokee master cylinder,,,, it's for dual disc. I just gotta figure if the ratio is the same. Making a 4 to 2 bolt adapter is no problem. I'll try to get a thread going once i get started on it....

One other guy did a summit kit and he loved it, I believe he used a power booster, and that's the one thing i'm going to try and avoid, we'll see.