For what it's worth, the plastic spark plug wire cover on the valve cover of my m102 won't stay put either..

I purchased a new one a couple years ago, because it was missing when I bought the car.

The wires are Bosch. I'm wondering if they are too thick.. Everything seems to be routed properly, but the top part of the cover won't stay seated into the bottom half, as if the fastener plugs were already stripped or something..

Just an eye sore really.

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2000 c280 Sport (looks like an upgrade, feels like a downgrade)
1991 190e 2.3 (sold)