O Ring Material - Glow Engine
 

I'm currently rebuilding an OS 46AX and wondering if the OS Engines stock replacement are made from Nitrile, Viton, Silicone or some other material.
Bit difficult to get the part I need need at the moment (for Carb and Needle) and looking to source something from the Hardware Shop to avoid further delay.
For some reason, there seems to be a shortage of these things and those that are around online are priced ridiculously.
Also, are they Metric or Imperial measurements.
Any advise would be most helpful.

So, OS Engines/Graupner Europe say they will not be getting new stock until Jan/Feb 2020.
I'm happy to say I now have the exact O-Rings for my OS46 from a engineering firm here in England.
Bought x30 for a fraction of the price as compared to OS Stock price.
Happy Days...............!