So as I am in cleaning and building mode now -- I am searching for rings -- 90mm diameter but the thickness I'm not sure on yet.
These have very tight clearances (almost zero) to the piston grooves.

Do we have any ideas on where these may be available.?

 

https://www.ebay.co.uk/itm/225689130941 ?

note: I did not check in details if these are actually correct of not


or maybe these guys

https://www.enginerebuilding.eu/jagu...jr-aj16sc.html

could have them available , would not cost anything to ask?

 

Yes. Thank you. This gives me hope to press on!