This is a A-161643AS Starter, DR/DD PN: 161643ASMain Description As Following : A-161643AS Starter, DR/DD P.N: 161643AS Rotation: CWTeeth: 10Type: DR/DDVolts/Kilowatts: 12 Stocked As: A-SNK0004 Found in Section & Models : Ignition & Electrical Parts > Starters & Related Parts, White/ Oliver/ Mpl Moline TRACTOR: 550 (DIESEL LATE) Associated Items : New Also A-FRM-IHOL, A-MM-O-550, A-OL-O-550, A-OL-P-550, A-OL-S-3VOLUME, A-SMO201 And : Rotation: CW Teeth: 10 Type: DR/DD Volts/Kilowatts: 12