woah! stop! and don't ruin these fittings. Treat them with tender loving care. They are some weird British standard size. You will not find them at any parts store.
Last year I was over in birfield land trying to figure these things out and all I can remember at the moment is that these things are unique so unique in fact, I had to have a bud make one for me. THe advice I took was either treat these with tlc or change your entire brake system.
You will however find master cylinders and brake cylinders that will accept these fittings. Do some more research over at birfield and perhaps here. I did come across a couple of threads dealing with your issue.
