I’ve been running the Rusty Hope kit on my truck for several years now. I cross referenced all of the part numbers given in the kit. Most of them covered many years and makes, but I narrowed it down to a common year, 1985. ‘85 Buick LaSaber calipers, ‘85 Dodge Diplomat Rotors, Ford F-150 bearings, etc...
You can send him your spindles, or you can drill and tap them for ourself if capable. Again, the drill and tap specs are in the instructions. I don’t recall the specifications anymore. I did them myself, but I also had the tooling available where I work. If you don’t, I’m sure you could find a local machine shop that could do the work cheaper than shipping them back and forth to Charlie. I pulled mine off when I drilled and tapped them, but I also wanted to replace the king pins at the same time. Otherwise, with a good drill, and a steady hand, you could do it in place without removing them.
I am still using the stock master cylinder and it is working fine. I realize that I am not gaining the added safety of a dual chamber M/C, but I’m OK with that for now. It stops straight and true without any issues.