My bracket ('63) was spot welded. Vibration broke welds clean thru tank and oil seeped out from under bracket. This is common with Atlas oil tanks. Best solution is to fabricate a new bracket from heavier gauge steel (12 ga.. I think, but maybe 14 is heavier than what Norton used), then weld all around new bracket. In my case, I first brazed all around bracket, but vibration broke again....then welding cannot be done over brazing.....had to cut out top of tank and weld a plate over, then do body work.
OTOH, if yours is not seeping oil, and you are comfortable with the retrofit, leave it alone.
Slick
BTW....if you fabricate a new bracket, be sure to include at least 1/8 radius at the 90 degree bend...vibration will fracture a tight bend.