The covers were installed to prevent the exhausting oil from foaming the oil dribbling downwards from the rotating assembly.

You can probably find them at an oldschool transmission shop - ask for them not for mercedes but for dodge charger/magnum or old jeep cherokee etc. they use the same transmission as our cars.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)