hello, I just got my first MB this week!!!!!!!!!!!!!
It is a kompressor 99 c230
Anyway, it has a stereo unit that takes cd changers but I have no idea what kind of changer it would take? anybody, please

 

If you are keeping the stock head unit, you will have to find an MB changer that works with the optical connection. Look for the MC3110 and MC3010 changers. The MC3198 will also work but it supposedly is more prone to skipping.