ssr yx150 motor needing parts!!!!!

My friend just bought a ssr 150tx and the the rings and piston are shot and the cylinder is shot. I was looking on tb for maybe a replacement jug and piston kit but couldnt seem to find exactly what i was looking for, the only thing i could find was for a piranha 150 which said was the honda style head. So my question is where is a good place to order parts for this motor. im needing a jug, piston, rings and a top end gasket kit any help or advise would be helpful so thank you in advance.