Already fitted JRH. Not a problem with that. Just want to make sure that the plate will join the two before I shell out the £35 for it. I am fairly certain it will but, just want to be sure. The plate should fit the rack and the box will fit as it is monolock and the plate will fit the arms. See below. This Givi M5M Monolock Plate, is designed to fit on to various motorcycle specific racks including Givi Monorack FZ Kits so that a Givi Top Box can be fitted. The Givi M5M Monolock mounting Plate is made from Nylon and supersedes the traditional Monolock plate which had an adjustable joint. This new system offers improved sturdiness whist remaining simple and easy to build or disassemble. This plate includes various nuts, bolts, washers and blanking caps.