There is no belly mower from John Deere that ou can just bolt on to your Yanmar. The reason being, the Deeres use mid PTO to drive the mower. The Yanmars do not have mid PTOs' You know have 2 choices. The are some after market belly mowers that run off of the rear PTO via belts and pulleys, or you might possibly kind a Yanmar front PTO kit and yanmar belly mower. Ebay is a good place to watch for those.