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Hey denete, no need to use the Denali bracket and even the nut is compatible if you want to reuse the Honda one.
It's late here but will try to get a picture tomorrow. I did use a bit of self amalgamating tape around the wire/connector junction on the original leads to make it look neater...
I fitted a Denali Soundbomb mini to my 2013 NC700X today. It's a like for like swap and much, much better than stock.
The horn wires are a little short so I had to release them a little from under another cable but they just reach without having to bend the bracket.