MG Magic is not a real “MG” distributor. I was told in the 1990’s that they were a couple of older guys in Miami that stockpile mostly CMC/Fiberfab and Datona Migi kit parts. They would probably never be buying from Moss and re-selling the stuff.
I tried to get some CMC/FiberFab Ford based TD parts from them a few years ago and they said they really only have stuff for the VW based cars made by the manufacturers I mentioned.
They had no British Coach Works or Classic Roadsters Ltd (Duchess) parts either.