Try the Car Audio section of this forum. May get more help over there.

I'll just briefly rave about my new unit that plays MP3 files. You can squeeze 10-15 standard audio CDs worth of music on a single CD in MP3 format. Better than a multi-disk player, IMHO.
Less clutter. Sure, the sound quality is somewhat lower, but the rest of my audio system is too primitive to notice.

Also, plenty of good 'Content' is easy to obtain in this form.

Best of luck.

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1986 300E 5-Speed 240k mi.