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Look closely at the rubber. There are different ones and their behavior with gas and oil can be deceptive if you don't get the good one (either swells, shrinks or even falls apart). The matching parts are designed to match precisely the oring's dimensions after its stabilization in the liquid...

I ordered 10 Oring of both sizes and changes them as needed, not very often. The shop sells only the whole cap, not enough money to make with just the seals.