No instructions like everyone else but I found a video of someone installing a similar backrest/rack on their Vulcan S which I watched . The bars to the rear were bent at first, but it all came together when I attached them to the bracket and trunk. It was definitely a pain to get up the butt and I'm glad it's in place. See the highlighted image to see where I attached the supplied screws (circled in red). You will need to remove the plastic piece (circled in green) and place a bracket underneath, then reattach the plastic piece.
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