I have one of those for my 47, the bucket has a bit of wire as a spring clip, the chrome rim is a very snug fit, and the T clip sits in OK and locks into the rim hole. I also have the B spring, but I don’t think it’s for my setup, as it’s too tight to put into the rim, and if you did (either way round)it does nix on the T clip.
8 inch light.
Thomas