Hi!
Do you mean the rubber on the analog stick? If yes, there are no parts for sale yet for the Joy-Con 2. There are parts available for the Joy-Con 1 but those sticks will not fit the Joy-Con 2.
It will be easier to replace the whole analog stick at once. The workaround you applied now is the best thing to do! Make sure you will keep that Joy-Con, whenever the parts are available you can fix that one!
Please let me know if you have any more questions!
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