I purchased Rizoma Club signals but I was struggling to find a way to mount them without doing some type of modification to the stock mounting location. The M8 bolt fit right into the wire hole in the stock location but the nut just wouldn't clear with the classic fender setup. I adapted factory light mounts by cutting the stalks off and drilling them out, then flipping the assembly around so the gap allows you to secure the nut to the signal bolt. Then bolt in with a slightly longer M6 bolt.