What year Dakota master cylinder

It looks like the Raybestos and the Dr Diff are the same except for price. Am I able to get just the 4 to 2 bolt adaptor and longer rod separately? The Raybestos is a lot cheaper and looks readily available at any parts store.
looks like there are options for adapters if you didn't feel like trying to make your own....
Mopar Master Cylinder Adapter
Wilwood Disc Brakes
https://www.classicindustries.com/p...zEGQWW9AZ2ct7rHs6VhoCNdoQAvD_BwE&gclsrc=aw.ds