I think you are after the rectangular plug, not the oval one, right? I think i can dig up that retangular plastic plug, I'll have a look this week.
In the meantime, i can offer you this: I made the corresponding hole in the metal with the following dimensions; it may give you some starting points for the plastic plug.
The hole in the metal is shaped by 4 holes of 20mm, spaced 28 mm apart in one direction, and 68 mm in the other direction. On top of that, it has a 45 degree chamfer all the way around. The depth of the hole is 3mm, so the plastic cover needs to span about 3+10+28+10+3=54mm by 3+10+63+10+3=89mm in the length direction. Here's a link to how I made the metal pressing tool for that hole. It's also where the picture of the sketch is coming from: https://e9coupe.com/forum/threads/fixing-that-little-rust-spot.18521/post-174968
some pics from my digital archive:
cover, mounted in a trial metal sheet - top side view
cover, bottom side:
As you can see it has 3 clips, 1 small rib (partially destroyed by me) and a low cylinder to locate the cover in the hole. Funny enough, there is also a thin round line that seems to follow the lip in the hole, but that lip is square shaped, not rounded. I recall that the line also runs the entire perimeter of the cover.
Edge is 2.5 mm thick.
Edge stands 0.8 mm high above surface, so plate thickness is 2.5 -0.8 =1.7 mm thick.
Cilinder is 4.7 mm thick
Corner has a 20mm radius
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