I have replaced the OEM horn with the above Ring Low Tone Horn. I think it is louder but certainly deeper and more invasive in tone. It was a straight fit and I only had to drill out the original fitting strap brackets to 8mm to fit the new horn fixing stud. I had to rotate one if the original spade fittings 180 degrees so that I could rotate the new horn sufficiently to drain if wet. It sits nicely in the horn moulding on the radiator and clears the forks on full lock. They can be found cheaply on eBay and Amazon and do a better job that the squeak of the OEM horn.