There are SEVERAL models that will work for your 2003 530i. As long as the Cd changer is I-bus based, it will work. You can buy one used between $150-$200 USD. In fact, I just sold one a little while ago.
If you're determined to buy a new part, then I suggest that you find the one that can play MP3 CDs. It costs about $475. This unit too has several part numbers.
In general accessories like this don't just have one part number. Over the months/years as new revisions come out, new part numbers are assigned. Sometimes new features are added like the MP3 capability.
I'm having problems with my 6 CD changer and have decided to declare CDs to be closing in on obsolescence and instead will go with a Ipod device that can be hooked to the CD changer's wiring.
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