Right. Perhaps the -140 unit has now being superseeded ... its possible.

Take a look at this link. It lists all the Sirius parts for the x5 individually.

http://www.circlebmw.com/parts/sirius/sirius-e53.htm

Good Luck !

Ps: I did a quick google search on that part # they gave you and its listed for a Mini ... so I'm not so sure !