This set up was invented for SCCA racing, I raced on this set up, made aluminum hubs for this set up before, and installed this set up on a few race cars, I've got plenty of experiecne with it. It more than is needed for a A series street car, but owrked well on the race cars. I can see why you would want to do this for a V8 conversion, warning they are a PITA to install, no two alike, acess to lathe and mill comes in real handy with this conversion. The ebay auction looks a bit junky/crusty for the money, I would pass, Winner Circle has the rotor/hub adapter in aluminum, and you use a MGB caliper (all MGB year models were the same) and a spitfire rotor (all years were the same as well, but don't use a GT6 rotor, they will not work for this conversion. Peter May Enginering in the UK, also offers a even higher level kit using vented rotors and Willwood 4 puck calipers, more money of course, but for sure cool, still way too much brake for the street in a normal 4 cylinder applications.