If you’re planning to fit a radial master cylinder and wish to retain your stock Yamaha mirrors, this part is for you. Since most radial master cylinders do not include mirror mounting provisions, you’re left devising your own mount. Not only does this part answer that need, but it’s also left hand threaded – just what you’ll need for a stock Yamaha throttle-side mirror – M10x1.25.
Made by Brembo, this part is made of anodized aluminum with an anodized finish that is similar to the stock 2015+ Yamaha R1’s Nissin master cylinder. Not exact, but pretty close! Includes mounting hardware.