I just purchased this one on ebay.
http://cgi.ebay.com/ws/eBayISAPI.dll...m=150023796523

I had e-mailed with the seller first and took pictures of my connectors before buying to make sure it'd fit. I have a 2001 X5 3.0 with non-dsp non-premium sound. I don't have the CD changer - so I plan on having 1 AUX for Ipod and 1 AUX for Satellite. I think the price is a bit steep but at least you can be assured it will fit and you can extend the capabilities of the stock system. I have the BSW Stage 1 and soon the new Subwoofer from them so my system will finally be complete (albeit for $1,400 tho!!!)

JG42 - you can try contacting this eBay seller as he appears to know the systems well and what will work for you.

Hopefully you get some good information.

Cheers
Joe