Front Runner Rack Adaptor Plates For Thule Slotted Load BarsProduct Description These adaptor plates give you the ability to attach a Thule slotted Load Bar or Aero Bar and Thule Accessories to a Front Runner Roof Rack. These adaptor plates give you the ability to attach 2 Thule slotted Load Bars or Aero Bars to a Front Runner Slimline II Roof Rack. If you currently own Thule Accessories and would like to use them with a Front Runner Slimline II Roof Rack, you can use your Thule load bars or Aero Bars to mount