You must be working on a 1438cc engine. They are part of the centrifugal oil filter located in the fornt crank pulley, only the 1438cc engines had that. I've never had to deal with those parts, so I do not know if they need rpelacement. See if any of the shop manuals have specs on them.
Csaba
'71 124 Spider, much modified
'17 124 Abarth, silver http://italiancarclub.com/csaba/
Co-owner of the best dang Fiat parts place in town
I have the shop manual, however they do not discuss this part. In fact the manual mainly shows "how to" on the 124 A.000 single cam motor, only addressing the 1438 in the specs tables. I wish I could find a shop manual that is only about the 1438. Well, thanks Csaba for your answer They look to be in good shape, however I didn't pay particular attention on the orientation of the rings so I'll have to find out before the rebuild.
1970 Fiat Spider 124 Sport aka "Pesto"
2002 Mazda Protege5
2013 Buddy 170i