I installed the Stebel horn today(sorry, just couldn't wait!). If you want to install the horn in the same position as the old one, you need some washers that will fit the bolt that comes with the horn. The rubber mount is too flimsy. If you want to install the relay where the old AI unit was mounted you need to buy a 3' length of 12-14 ga wire to add onto the fused wire that comes with the install kit.It needs to be soldered.You also need to find that bolt that goes into the mount! Whats nice is that the horn wires will plug directly into the relay without altering. And that's that.