Make your master cylinder conversion simple.
These Mopar Performance master cylinder adapters are designed to fit the Mopar Performance master cylinder assemblies P5249270 and P5249271. They include an adapter block, two retaining nuts, and studs. The adapters allow you to convert from the 4-stud setup to the 2-stud newer style design.

Master Cylinder Adapter, Converts 4 Stud Booster to 2 Stud Master Cylinder, Includes 2 Studs, Each