Hi Frank.
Last year i did my valve cover gasket. I used the MB original. Touch would it just fitted fine and is holding good. I know fastlane has some after market. But I think the diff is not very substantial. So its you call. MB or aftermarket. If you do go for aftermarket checkout Fastlane before you go for Felpro or Beck-A.

MVK

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1985 300D Turbo 179,000miles