Yakima Platform Basket Stainless Adapter

If your ladder rack is a little older then what you can do is measure the T-Slot on your crossbars to see if the hardware will fit Attached is a photo of the

An adaptor for fitting the Thule ProRide or Thule UpRide bike carriers directly in the t-track of some BMW and Renault original load bars

thule fietsendrager slot Thule T Track Bolts Adapter Fitting Kit for Roof Box Roof Rack Bars 697104 · Goode-Leisure · 100% positive feedback

thule t slot Fits load carrier bars with T-track width 20 mm Replaces standard Thule roof box mounting system Power-Click