I have a brand new overvoltage protection relay for a 124. It is made in Germany, OEM Mercedes. I bought this to see if it would do anything for some idle problems, installed it for literally 3-4 minutes, and it didn't so I took it out. So it's basically unused. $50 shipped in continental US.

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