650 H1 motor wanted

My father has a 2007 arctic cat prowler 650. He recently started getting some vibration and metal on metal grinding and knocking under a load in high and also when braking hard. we went through the clutch and finally found the issue. When we removed the driven clutchwe found that the bearing had been chewed up and pieces sucked into the transmission and engine. Looking for a complete replacement motor since the cylinder is scored from all the metal particles.