I believe these are the brackets you are referring to. It appears there is tape on the end of the one closest to the can.
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Hard to imagine they would say "(2) metal brackets with duct tape" and then only show one, basically (or one and a half) though I agree that there's the gas can and there's two metal brackets so that's probably them.
The vision I had when I first read that statement about the brackets was that they were partially wrapped with duct tape. Some people wrap the bottom part of the bracket with duct tape for a padding (like if you're hanging something on them that you don't want to get scratched). Kind of mickey-mouse but it works. Looks like I may have been wrong, though.