I've had the same problem with several of my Nortons over the years; the metal bracket front gas tank mount "wings" ... fouling into the gas tank. And, I've just cut off the bracket ends until it fits. These old British bikes NEVER had the precision tolerances of a "Honda." Seems like most every part you have to "fettle with" to make it fit. Cut, drill, file, etc. just the way it is. But Nortons and Triumphs look cool, and are fun to ride.