So I have a calmini rack on my truck. Does anyone know the correct Yakima Qtower (I think thats what they are called) to attach the Yakima crossbars to my Calmini roof rack?

I need a couple of center crossbars to be able to mount the rooftop cargo box I have. I was thinking of having something fab'd up for this but I would probably be cheaper to buy the yakima bars if possible, and I could use them on other cars as well.

Mark