98' CLK 320 M112 Engine

OK...so on my continuing quest to drive a "perfect" car, my next task is to tackle the minor oil leak from my valve covers. Not the valve cover gaskets, but the actual valve cover is leaking. At first I thought it was the oil cap and the oil filler neck so I R&R both. It seemed to take care of the majority of the oil leak but there is still some seeping through. I posted a pic of where it is leaking. I replaced both valve cover gaskets 8 months ago and it seems to be holding up but this time it's the cover that is on the cover.

The problem is, I can't seem to find a gasket to go here. Is there a gasket? What is it called? If no gasket, do I use MB silicone? Any and all help will be appreciated. Thanks again!

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