I just bought a used thule frontier cargo box to use on a 2015 honda civic to carry skis and/or snowboards. I am looking at buying a used roof rack or buying the rack in pieces new on ebay. Does cross-bar shape matter when considering a rack to be used with this box? I notice that yakima often has a round bar where Thule has a square or wing shape. Will my box connect with either system? The connection hardware are flat plates with foam that makes contact with the bar. Any thoughts on this is greatly appreciated. I am trying not to spend more than $150 for the roof rack.