I'd go see the dealer with that photo. They should easily be able to pull up the diagram, order the part and take your money. Cant be all that expensive and it will be correct and seal properly.

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Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red