There might be a kit available from Mercedes Benz, including the CD changer. I would however recommend changing the head unit (tape deck) in the dash for something more modern that also has ipod hookups, and maybe a hard drive too.
If I recall the CD Changer option back in 2001-2002 for any MB was over $500. Installation might run you a few hundred too, so in my opinion no it's not worth it as it was and probably still is ridiculously expensive.
You can get a good quality head unit with a CD/MP3 player, ipod hookup, and other features, including professional installation for under $500 tops.
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