MPDano: sorry for late reply. great question and i'm sure everyone else would like to know as well. i have a thread in the sponsor section, but here you go:
E53 interior trim $250.00
E53 steering wheel insert $30.00
if it's a color/pattern i don't stock it will be extra $50-$80 for material cost. prices do not include shipping both ways. if you are local and want me to remove the parts that would be a bit more as well, since the x5 is not the easiest trim to remove out of the car... I will honor a -$50.00 discount till the end of Feb for you guys!!!