Sorry for the very late reply, I put the whole thing on hold. Then my water pump died after I tensioned the belt and now that it's fixed I was reminded that it leaks oil. So now I've ordered the o-rings.
What thickness is the gasket, do you know? Either way, thanks a lot for looking up the dimensions!
I found some OEM numbers on my search by the way. If someone else is looking in the future, maybe this helps.
EA81 Oil Pump O-ring part numbers: (dimensions in MM)
806915050 (15,5x1.5)
806949030 (49.7x3.5)
806914020 (14x2.4)
806938020 (38.2x3)
Body Gasket:
424207000