6 disc CD changer upgrade
 

I had a 2007 MZ3 hatch with the (non Bose) 6 disc changer. I also was able to unlock the "free" trip computer. That car was surrendered in a BK 2 years ago, but I just found and bought a near clone 2008, even the same color. Alas, it has the single disc CD player. I see used units on the interweb for very decent prices, and it seems to be an easy swap. I want the 6 disc changer, mostly for it's apparent (?) better sound quality, more power(?), and the trip computer would be nice, but not neccesary. Sirius XM would also be a plus, as I subscribe by the year for OTR trucking already. My question is which part # am I looking for? Also, my 2007 radio was silver, my 2008 is a satin black color, and I want to keep the black look. Any help would be great.