Buying Advice 18x8.50 rear tire

Does anyone know where I can purchase a 18x8.50 tubeless rear tire for my JD 175 Hydro, I have a small hole on the side wall. Or if anyone has any ideas on how to fix, I used super glue and rubber last year but it has finally come off.

Thanks,
TC

Take the ties off and patch it. I have put a plug in the side wall and works fine

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