Looks like it'll fit any bar that is within the mounting screw span. My have to buy longer screws if your bars are thick.
Hi, Yes these will fit on the factory cross bars of your 2008 Yukon XL
Hello, these will fit on crossbars no wider than 3.5" and no thicker than 1.25"> You will also need approximately 2.75" of clearance from the bottom of the crossbar to the top of the vehicle's roof.
Hello - These clamps will fit an oval shaped crossbar that is 40mm tall and 80mm wide.