Spoke to Pete... (thank you for the contact) - he does not have the 104.5 moly rings... suggested JE - but they also don't have the rings with such dimentions... I talked to guys from Total Seal - they can make the first ring groove in Mahle piston wider - from 1.75 mm to 2.0 mm and can provide with the moly rings of that size... So it's an option. But... I want to see if it's at all possible to find moly rings (104.5 mm: 1.75 mm, 2 mm, 3 mm) either from Mahle, Goetze or some other company... which would Porsche approve.
It's kind of OCD...