Heavy Duty Fitting Kit (suits MasterFit range)
Heavy Duty Fitting Kit (suits MasterFit range), When mounting MasterFit Roof Boxes to the Rhino-Rack Heavy Duty cross bars, you will need a RUBK-MF Fitting Kit. This is a set of 4 square u bolts designed to attach the MasterFit Luggage Box directly to the Heavy Duty Style Cross Bars.