In order to mount your older Thule Ski Carrier model 724 on Inno Aero crossbars like the # INXB130-2 you'll need to use the Thule XADAPT2 AeroBlade and Xsporter Load Bar Adapter for Roof-Mounted Carriers # Xadapt2. The XAdapt2 is designed to convert older Thule carriers for use with aero style bars with T-slot mounting channels; the XAdapt 2 t-slot hardware will fit in the Inno Aero bars t-slots. view full answer...