I have searched all of the relevant posts but can't find the answer to my question. I am attempting to install an MC3198 CD changer in my 1999 SL500. Everyone says it's just plug and play but I do not have any fiber optic connector in my trunk. Really, I don't. What I do have are four connectors bundled together: a coax probably for the phone, a power connector that does hook up to the MC3198, a 15 pin female connector, and a 25 pin female connector.
Is there some magical connector that connects to my CD changer and then to either the 15 pin or 25 pin connector? That's the only thing I can think of that would make this work. Or, do I have some weird hybrid wiring scheme? Any thoughts would be greatly appreciated.

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