You should be able to use a normal bar-end Mirrycle mirror with the stock arc handlebar on the Fusion. Thrre isn't too much sweep so it still works as long as the mirror is adjustable enough. I did that at first. When I switched to a north roads type bar, I had to find a different solution.

I don't know the difference in the light switch options; they seem the same. I read a review a year ago where another guy couldn't tell the difference either. I've seen the light on other bikes, like the new Raleigh Detour Deluxe, so maybe someone here knows what that's about.