Very nice! I ordered the Yamaha top case mount from YAMAHA of Rancho Cucamonga (https://www.yocracing.com/accessory_store/store/yoc_viewitem.asp?idproduct=740545), but they don't sell the Yamaha GYT Top Case on their site. What other company top case fits onto this mounting plate, GIVI, Shad, Kappa? Is the mounting plate monokey or monolock?