2.5 TDI: Unknown part of the oil pump chain

hallo, ich habe hier u.a. mein Cabrio mit 2,5 TDi BDG. Nachdem der nun schon 2 Jahre wegen diverser Problemchen steht, will ich demnächst mal wieder ran gehen. U.a. hängt seit Jahren die Kette der Ölpumpe durch. Der hat damit bestimmt schon 50T km gemacht, bis ich mal die Ölwanne ab hatte und dann ein unbekanntes Bruchstück gefunden hatte (s Bild). Das ist definitiv ein Teil des Spannhebels an der Ölpumpenkette, kommt anscheinend öfters mal vor. Bisher ist mir nicht klar, wie ich das Teil und die Kette rausbekomme. HaI found some information about expanding the oil pump, but not for all parts.

"But my biggest problem is that this lever doesn't have a part number yet. I've searched on several platforms (7zap, webautocats, etc.). The part is shown in picture sheet 115-060, but without a number and only with a reference to another picture sheet, 103-032. However, I can't find the latter anywhere. Also, because I can't explicitly search for picture sheet numbers in 7zap and other platforms."
I would also like to replace the corresponding tensioner, part number 059 115 124 C, but it's nowhere to be found, neither as an accessory item nor from Audi parts dealers! (The part number has been omitted). Instead, when searching online with that number, various suppliers list a timing chain kit (without the tensioner!). The timing chain itself has the correct part number 059 115 125 A (approximately 25.-).

Is the 2.5 TDI engine now so rare that spare parts like this are no longer available? If I had the part number on the lever, it would probably be the same situation...
"Surely there are several people in the community who own vehicles with a 2.5 TDI engine and have already replaced these problematic parts?"
And if you have any other tips or suggestions for discussion, that would be great.
Thank you very much.
Andreas