SaltCoupe, the old style band clamps and bracket you have are the best way to go in my opinion. the just work great. they don't damage the tank at all. for example anytime you use a hose clamp and go to tighten it up the back of the worm gear housing can dig into the side of the tank and damage it. unless you position under the bracket similar to what you got.
your style clamp just looks cleaner.:thumbsup: doesn't look like you rig it with a hose clamp..:doah:
also it doesn't hurt to put just a very thin rubber material over the bracket first before the tank sits on. makesure to use a good vented cap that doesn't piss gas out of the vent hole. if you are just using the standard vent cap with a paper gasket. i would pop out the gasket and install a very small piece of gas resistant foam. for example foam from a briggs air cleaner would work. that should help keep the gas from shooting up in your lap or worst into your eye's....