oil film around the ignition coil packs

[supradupe]

It seems there is a small leakage on the passenger side valve cover. I moved aside the air intake duct, there is a cover approx. 3-4" wide and 8" or so long secured by 2 torx screws and 2 external torx bolts. This thing sits on top of the valve cover. I believe the hot oil fume is coming through there as oil is most abundent around this area. However, upon looking at the ML part list, I couldn't find the name of this cover. Or is this an integral part of the valve cover? I can see there is rubber in between. Anyone knows what this part number would be? Thanks.
steve
p.s.: this is for a 98 ML with a Sept 97 production date.