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Factory filler neck has a flange that goes against the inside of the fender, 3 screws from outside attach it.
Must be an aftermarket aux tank installation.
Use a bronco filler neck. 2 versions for the vented and non-vented gas caps you probably have a junkyard special now. So the aux tank is likely a retrofit, maybe a repair. Don't be surprised if it isn't a match for your year.
The thing is we don't know what parts you have. We know what a stock Bronco filler neck should look like, and that isn't it. Outside of that it is just guesses and assumptions.