This is the fitting kit you will need to fit your Hybrid Bike Carrier to the C-Channel of your Vortex cross bar.
Bike Carrier C-Channel Fit Kit; For Use w/Hybrid Bike Carrier PN[RBC050];
Rhino-Rack C-Channel Fitting Kit for Hybrid Bike Carrier
Bike Carrier C-Channel Fit Kit
C CHANNEL FIT KIT RBC050
Bike Carrier Adapter