Does the parts guy at the dealership have any info?

My 95 SL500 came with an Alpine CD changer...just traded that in for a 2001 CLK430...ALSO equipped with the Alpine CD changer (in fact, just swapped the cartridges out when we took delivery).

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car