It might be worth contacting EAG to see if they have interest in the X.

Enthusiast Auto Group Cincinnati Performance BMW Center

These guys get top dollar for the "best of the best" BMWs (Like the 2002 E39 M5 priced at $65,000 currently). You could see an acceptable offer from them.

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!