Engine vent fitting doesnt fit anymore?

ok so i got a 2006 rm125 and theres this vent or overflow or something on top of the engine and the fitting thats supposed to go in it doesnt fit in there no more, the hole is too big, and i know it isnt thw fitting cause i tried it in the other vent and it fit fine, ill post a picture of the hole and the fitting, does anyone know any tricks to fix this?
 

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