I also got mine from Potomac German. I forgot how much it cost, something like $250 and the labor (at $75 an hour at a Mercedes specialist) was about 2 or 3 hours. Very reasonable IMO.

Alex

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1983 300D (parked for four years)
2012 VW Sportwagen TDI Manual
2001 Miata SE
1962 Chevrolet Corvair Rampside