If you'll forgive a couple of editorial comments right up front:
(1) It's a very cool looking machine.
(2) The previous owner didn't give you very much of a Rocket front end to work with! And,
(3) The handling of this odd combination has got to be pretty unorthodox compared to either bike originally, so whatever you do to it is probably not going to make it much more unsafe than it already is.
I mention the latter point
partly in jest, because, in general, if a front end is designed for dual rotors, it's best to balance the braking load between both sides, not apply it all to one. And, I hope you'll clarify what you mean when you say "standard" hex head bolts. I don't pretend to be an expert on brakes, but if you mean something from the hardware store, I doubt you'll end up with bolts that can be safely torqued to the spec for Rocket brakes. Whether that will matter, who knows, but I wouldn't bet my own life on it. At the very least I'd try to find bolts of a grade used on
some manufacture of motorcycle brakes, not just any general purpose bolt.
As for an America brake line versus a Rocket one, who knows. I have no idea if either one would be the right size for the hybrid as it exists now, or as it will be after you put a different bar on it. You'll probably have to make that decision later.
I'll leave your post here for a while so that other members can answer the bar size question and take a shot at the other questions ...they may have a different take on what you're asking. Later, I'll probably move this thread to the workshop questions forum, where more all-purpose mechanics can take a look at it.
I'd also encourage you to seek the advice of a local professional motorcycle mechanic on the brake situation. And, if you haven't already done so, you might also want to ask on some sites that specialize in chopping and bobbing. As you may have guessed, what your bike already has are not the sort of mods most of us Rocket captains have attempted on our own machines.
america owner needs advice
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