Kabota RG-15 crawler carrier tracks

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I have two fo theese little gems and I cannot find any books or tracks for them. I have tried several aftermarket track dealers and they cannot get the track I need. I believe the track on it is a 230-44-86. If I change the sprocket to a 72 pich there is a track available. But I cannot get the sprockets off to have new ones made. Can anyone hel[p here? Thanks so much Steve S.