My Seat Leon Sylance of 2007 model year had built a really embarrassing horn, and thus they had to be replaced!
This sounds a lot better! (A pre-post video can be found on YouTube with the ID: O0bOgsQazHs)
Thanks enclosed sheets installation was easy. As an additional screw I required to screw both to the original holder. The Relais I have not used, but directly connected to the original wiring via cable splitter (Fused with 15A).