It looks like it could be part number 55189070. I found it under
101 Crankcase and cylinders head
10106 Camshaft drive
10106/00 Camshaft drive
in ePer
Googling for that part numbers gives a German eBay page where the photo looks like a match https://www.ebay.de/p/1115595153?iid=383378043745
but no guarantees
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P.S. should there be a gasket (in the illustration part no. 2) between the plastic cam belt cover or not? I bought one, original part but it seems it is too thick to fit between the cam belt cover and the engine body.