Besides polishing, also verify the minor diameter (minimum diameter) of the original and the replacement part at the groove with calipers.
Difficult to see, but on your photo it looks like the installed o-ring is barely sticking out above the diameter of the boss. Rule of thumb the groove depth should be ~75-80% of the o-ring cross section. The o-ring should also be slightly expanded, so it is not loose around the part (o-ring ID should be slightly smaller than the diameter of the grooved section).
You can go up to a next size o-ring cross section to get some more compression on the o-ring as well (HNBR material). You should feel it compressing as you install the part.
Difficult to see, but on your photo it looks like the installed o-ring is barely sticking out above the diameter of the boss. Rule of thumb the groove depth should be ~75-80% of the o-ring cross section. The o-ring should also be slightly expanded, so it is not loose around the part (o-ring ID should be slightly smaller than the diameter of the grooved section).
You can go up to a next size o-ring cross section to get some more compression on the o-ring as well (HNBR material). You should feel it compressing as you install the part.
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