Amazon has round gaskets for the 5 gallon can as well as the oblong gaskets for the NATO 20 liter can.
https://www.amazon.com/GASKETS-Gallon-Rubber-MILITARY-USMC-80/dp/B01ENU2CGM
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Type: Posts; User: gwp; Keyword(s):
Amazon has round gaskets for the 5 gallon can as well as the oblong gaskets for the NATO 20 liter can.
https://www.amazon.com/GASKETS-Gallon-Rubber-MILITARY-USMC-80/dp/B01ENU2CGM
...