This is a A-102103A Trans Disc: 7" PN: 102103AMain Description As Following : A-102103A Trans Disc: 7" P.N: 102103A Spline Count: 19Spline Diameter: 1.553" Found in Section & Models : Clutch Parts > Power Booster Clutch, White/ Oliver/ Mpl Moline TRACTOR: 770, White/ Oliver/ Mpl Moline TRACTOR: 880 Associated Items : New Also A-FRM-IHOL, A-OL-O-770, A-OL-O-770880, A-OL-P-770-880, A-OL-S-3VOLUME, A-SMO201, A-FRM-IHOL, A-OL-O-770880, A-OL-P-770-880, A-OL-S-3VOLUME, A-SMO201 And : Spline Count: 19 Spline Diameter: 1.553"