Rotor including pinion shaft

we want to buy two set rotor with this description :
ROTOR COMPLEAT ,STG 1 &2 , INCLUDING OF PINION SHAFT COMPLETE WITH P/N:513717700 AND IMPELLERS WITH P/N: 4012489 FOR STG 1 AND 4012490 FOR STG 2,
(IN N2 PRESSURISED CONTAINER)
ROTOR COMPLEAT,3RD STAGE , INCLUDING OF PINION SHAFT COMPLETE WITH P/N:513717800 AND IMPELLER WITH P/N: 4012491
(IN N2 PRESSURISED CONTAINER)
TYPE: KX-70-3 CENTRIFUGAL COMPRESSOR
MFR: AG KEUHNLE KOPP&KAUSCH,PGW TURBO