What size piston do I have

So when I bought my 04 rm125 the guy I bought it from said it may be bored out and it blew up the other day and it turns out that it is bored out it is 58mm and I was wondering what cc that is and do need to buy just a 125 piston and an oversized ring or a bigger piston thank you for any input

All the info you need is right here: http://bfy.tw/4tCa

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