I found it just by digging around online. Wilwood makes the assembly, allows me to run two different sized master cylinders for front and back, and on top of that the horizontal bolt close to the firewall allows me to adjust brake bias between the cylinders, lots of adjustability. It comes with this cable so I can adjust the brake bias from inside the car.
Yes, all new brake lines. I bought pre-bent hard lines and some distribution blocks. Once I get the rear suspension off, I’ll replace the lines, then figure out how to attach the cylinders, probably get some flexible stainless steel lines for that.