BrianT, thanks for the response. I have been told that the stock drum MC also works, but way back in auto shop classes ( long time ago ) we were taught that the drum and disc use such a different amount of fluid flow, and pressure, that they were very critical to match up correctly. But almost everyone who has 4 wheel disc conversions uses the disc/drum MC. Isn't there a bolt on later model MC off a mopar car or truck that will work? I would like to use the aluminum one if I can, and I guess if I have to get the adapter, then I will. Just trying to go straight to the parts store and pick one up to keep it simple. Anyone else have ideas or what they have used. There should be a sticky for Master Cyl apps, and disc brake how to's with pics. I have pics of my rears but I haven't posted them yet. I used the Right Stuff kit.