Will Beef Bars work with Yakima Skybox?

Has anyone used the beef bars with a yakima sky box ? I know the other crossbar option will work for sure, but I love the look of the black beef bars. Also has anyone used any sort of box on their GFC?

I know others have used cargo boxes but I’ve only seen them used with Yakima round bars. I’d love to know if they work with beef bars as well.

Here’s how I did my Yakima Skybox install on Beef rack bars.
More photos are on my website, click here