Original disc brake parts wanted

Thanks for the info ! While starting my rebuild, I noticed that the cylinder that hyper extended looks like it's a bit gobbed up and the same with that piston. So instead of spending more time and money on parts and rebuilding, I'm opting for remanufactured pieces from rock auto. But I really appreciate the information, especially that last post about how all Kelsey Hayes 4 piston are the same between manufacturers