Are the Bonnie tanks significantly smaller than that of the cruisers? I have an 07 Speedmaster with 5k miles on the clock and usually start looking for fuel at around 130 miles (if I've been playing) going up to 150+ miles. This is combined town riding/long A-road runs.
I usually fill it with...
Not sure what a "Sealed anchor nut" is but if you remove whatever's holding the badges on, you're left with 4 threaded holes. Fill em with liquid metal or any body repair paste.