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Take your stock o ring and head to your local hardware store in the plumbing section you can find black o rings that will work. This is what I did after rebuilding my diff I tore the o ring swapped it out and no leaks.
The stock Arrma gaskets appear to be Silicone.
Most orings that you'll find at a hardware store are Nitrile (also known as Buna-n), or Viton.
All of the above will work as suitable replacements but Viton is noticeably more expensive and mainly reserved for higher temperatures applications (above what your diff will see), along with superior chemical resistance to fuels and acids both in liquid and vapor form.
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