Just in case anyone is interested, I just removed my original speakers from my '82 300D-T to replace them with some aftermarket speakers. (One of the front and one of the rear speakers has a hole in the paper cone.) I was just going to throw them away. But if anyone really wants them, they can have them for "free" if they cover my shipping costs.
I pulled the original Becker Grand Prix Electronic head unit out as well but I am planning on keeping it since it is in decent condition and is 100% functional.
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'82 300D Turbo, 319,000 miles, 623 light ivory (hellelfinbein)
'79 300TD, 276,000 miles (Now sold )