I recently ordered the Thule 91726 Universal Ski / Snowboard Rack...it didn't work as the OEM cross-members I have were too thick. So I removed the cross-members and purchased the Thule 5401 Snowcat Ski-Snowboard Rack. It locks onto the OEM roof rails and worked perfectly. Member brian5 hooked me up with the below link:
http://www.orsracksdirect.com/thule-...ard-racks.html
A rep from Inno says theirs will fit the X5 cross-members but i went with the Thule Snowcat instead.