2.5 TDI: Parts found in the oil pan

Hello, I sealed the oil pan on my 2.5 TDI BDG engine (280,000 km) some time ago. During that process, I found two pieces inside the pan (Picture 2). One of them is made of metal (Detail Picture 1), and the other is made of plastic.
"I once found a post with the same (metal) part and the same question using Google Image Search (but I can't find it now). The answer there incorrectly stated that it was a fragment of a drawbar. That is clearly wrong. The part also doesn't appear to be broken off; rather, it seems like it must have been pressed in somewhere."
I suspect it might be something related to the chain tensioner of the oil pump, as the chain itself seems very stiff. The plastic piece could have been a clip from a rail or track.
Can anyone definitively identify this? I'm sure I'm not the only one who has fished this out of oil before.

Thank you.
Andreas

Hi there,
That could be a component from a chain drive system.
I would either look for the part in the parts catalog (RLF) or in the exploded diagrams.
hg
Herbert.