I have a 1970 Norton Commando that I am restoring. I like the look of a beefy front end. I would like to install the chrome headlight brackets that are tubes with ears that slide over the fork tubes between the top and bottom trees. The brackets I see for sale say 1971 and on. I am sure the distance between the trees did not change from 70 to 71?? Would the later year brackets fit a 70? What I would REALLY like to use are the brackets that get wider as they go down..(kinda cone shaped) Would those fit?? Thanks for any info!