You might want to check on the type of signal cable required for your CD changer first. I don't recall what year Mercedes started using fiber optic cable for the CD player but the 1999 model year might require fiber optic.

Try posting in the car audio forum or do a search.

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Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles