The Motorola Bluetooth/Assist modules will only work with X5's produced from April 2004 and on.
For a 2003 you will need to go with a Visteon BT module.
(of note, if you look up that part which you reference in your original post and look it up on realoem.com is shows as a discontinued TCU and references CDMA, which makes me wonder if this may be a CPT9000 TCU for the V60i phone
- See
http://www.realoem.com/bmw/showparts...=84&fg=10&hl=7 )
I assume this is the auction you were looking at -
http://cgi.ebay.com/ws/eBayISAPI.dll...MEWA%3AIT&rd=1
Jeff
p.s. - Randy at EIS is the source I would recommend for getting the BT components you need -
http://eiskits.com/BMW.html