Kobura: I just asked James at Radical Roadsters which part number i needed. I'm unsure what kind of part I would get if I ordered it from Backdraft as it does not describe it and didnt want this same unit, so I just ordered it from Summit. The Part number is 260-1304 for the Wilwood Master Cylinder off Summit. The slave cylinder is from a 88 Mazda B2000 in case you need to reference it later.
Waiting for the part to come in, then me and Clois (thanks buddy)will stick it in hopefully this weekend if he finishes his big project.
James at RR is on vacation or he would have sent me one overnight. Wanted to get the parts sent my way so I'm not sure. It was only $58 including shipping.