The kit's horn tube was too short... it would leave the horn bulb hanging in space. So I had to replace it with one I made by bending brass rod to shape. Bending a part like that is mostly trial and error... there's really no way to "lay it out" beforehand. You just have to eyeball it, bend it where you thing it should be bent, test fit it, rebend, test fit it, rebend... etc. I also had to scratchbuild the mounting bracket, using thin sheet aluminum, cut to size, drilled, and bent.