When I got my '84 300D, it had an Okidata phone installed, and the main unit was attached to that flimsy steel panel behind the fuel tank. I think this phone came as an option in '84, but at any rate, it was installed at the factory or at the dealer. Several years of the sheetmetal screws grinding into the back of the tank took their toll, and I soon had the same problems as above. Cleaned, sanded, and J-B Welded...still holding fast.

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Matt
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1995 E300 Diesel (Die Blau Frau)