I'm going to answer this assuming you have an X3, but from the question I have doubts...
The answer is simple: no feet! The "utility" or crossbars connect to the rails that are standard on on North American X3s. This is true for the BMW setup, Thule, Yakima, etc. For Thule & Yakima you buy a pair of cross bars and the adapters that bolt them onto the existing rails. (See pix 1) Then you get the ski or bike or whatever accessories you want. The crossbars come with the adapters already on them for the BMW set-up. (Pix 2)
Although Pix 1 is from Thule, Yakima has two similar setups. Look at their "Railgrab" and "Lowrider". Either use 58" crossbars.
All of the above applies to the rooftop set-up. You may also have rails inside the cargo area and there is an optional trailer hitch.
Let me know if you want additional links to photos of any of this.
Recent ED: 25 June 10, 328xiT in Red. Then headed SW to Italy & France. Flew home via Rome. Hoegh Kobe departed 22 July; unloaded at PH 17 Aug. Redelivery 11 Sept. (Re-redelivery 14 Sept....read the details here.)
Previous ED: 7 June 08, X3 3.0si in rosso corsa (*), then off to Italy, Austria, Slovenia. (*Note: A61 Crimson Red north of the Alps.)
Back-up vehicle (while waiting for re-deliveries): 1999 M Roadster in Estoril Blue.
Last edited by b-y; 09-16-2009 at 10:26 PM.
Reason: Yakima details added