I'm using Yakima crossbars mounted on the BMW OEM rails with Yakima towers. They seem to work well with Thule also. I have a Thule Cascade Cargo box.

You can't go wrong with either Thule or Yakima. If you haven't bought the crossbars yet and thinking of getting the Thule snowboard rack, just stick with the entire Thule system and as mentioned from previous post, try and get the same locks for the whole system.

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2007 E70 3.0