It is possible to put them into a 2003. I got 2004+ lights for my 2001 and had to make a minor pin connector change on the tail light wiring harness. This this may help..scroll down in thread.

http://www.xoutpost.com/bmw-sav-foru...hts-03-x5.html

I can ship them to you...they are boxed and I'm sure it'd not be much to get it to Wyoming.

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2007 328i Sport, Monaco Blue
2011 X35D - sold -Space Grey
2004 X5 4.4i - sold - Kalahari Beige
2001 X5 3.0i - sold - Pearl Beige
2006 325i Sport, Sonora Beige
2000 323i - sold - Sienna Red