If the horn is a delta horn, yeah about 20-40 bucks, it looks as if it was another brand horn that had a handlebar mount. If it not a delta, then maybe 10-15 if it works. And yes you can mount it in your tank, but the button is covered by the badge, but it would be cool to extend the wires to one of the black box or one of the tank buttons. If your still looking for a dx, there was a guy that bought a bunch of bikes about a month ago, i think i posted a link or something a few pages back, you should pm that guy to see if he still has one. Also always confirm the part with a picture. Ryan is right even through the cabe has many knowledgable people, there are a lot of trolls trying to sell stuff too.