MAN B&W.S50MC.P90201-0202-072 “Piston Ring 1 – 12.38 mm ” MAN B&W.S50MC.P90201-0202-084 “Piston Ring 2 – 9.38 mm ” MAN B&W.S50MC.P90201-0202-096 “Piston Ring 3 – 9.38 mm “