I have a complete set of 4 factory speakers (2 front, 2 rear) from a 1987 300E. Working fine when replaced with Rainbow two-ways speakers at 80k miles. $50 for the set of 4 and I'll pay shipping in cont. US. I think these are made by Blaupunkt but I haven't looked at the them in a long time.

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2005 Mercedes C230k sport sedan, 6 speed
1987 Porsche 924S - 968-engined track car