If you have a Rhino-Rack Vortex or Heavy Duty Crossbar system and want to mount a number of Rhino’s kayak and canoe carriers including the S510, S512 or the Kayak Extension Piece S512X you will need the KC-FK8 fitting kit. This fitting kit will also suit the Thule Aero and Thule Aeroblade cross bars. The kit comes with all the necessary items including screws, washers and other pieces to attach the kayak carriers to your Rhino-Rack and Thule cross bars.• Attach the S510, S512, S511Xor S512X to your Rhino-Rack Vortex and Heavy Duty cross bars
• Also suitable to fit Thule Aero and Aeroblade bars
• Comes with all the necessary items required
• Use the long channel nuts to fit to the Vortex bar's C-Channel