My brace is about to go on my 55. I'm going to get a piece of stainless steel and shape it into a "T", with a little bend along the top of the "T" to go along the face of the tank (still hidden behind the frame). I'm then going to epoxy it in with some 30 minute epoxy. You could take the same idea and modify it for your use. Just make sure you have a large area to apply the epoxy to the steel and the tank, so the epoxy doesn't shear off the framing.