Kuryakyn Mirror Adapter For Yamaha Metric Cruiser Kuryaykyn mirror adapters are just what you need to help mount your new Kuryakyn mirrors on your metric cruiser. They are also great for a universal option for mounting many other mirrors with tapped 5/16-18 hole. Features Specifically for mounting Kuryakyn mirrors Re-uses some of the factory hardware Stainless steel construction Tapped 5/16-18 hole