MAN B&W.S70MC.90201-181-072 Piston ring no.1 MAN B&W.S70MC.90201-181-084 Piston ring no.2 MAN B&W.S70MC.90201-181-096 Piston ring no.3 MAN B&W.S70MC.90201-181-106 Piston ring no.4