OK, here is the situation. My 1980 300SD has a Becker "Mexico" radio with cassette. The cassette player does not work and the door for the cassette is broken, so it stays open. I would like to replace the unit with a newer Becker "Grand Prix" Model 754 from a '87 300D. I have had the "Mexico" radio out and it is hard wired, while the later "Grand Prix" model has plugs for the wires. Can someone help identify how to wire the later model radio into my '80 W116?

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• 2001 E320