This is a A-KA576A Coupler, Drive PN: KA576AMain Description As Following : A-KA576A Coupler, Drive P.N: KA576A Used w/ Trans. Input Shafts: 1K616A & 1K616.Dim A (1): 4.159" LongSpline Count: 19 Spline Found in Section & Models : Transmission & Rear Axle > Drive Couplers and Chains, White/ Oliver/ Mpl Moline TRACTOR: SUPER 77, White/ Oliver/ Mpl Moline TRACTOR: SUPER 88, White/ Oliver/ Mpl Moline TRACTOR: 77, White/ Oliver/ Mpl Moline TRACTOR: 770, White/ Oliver/ Mpl Moline TRACTOR: 88, White/ Oliver/ Mpl Moline TRACTOR: 880 Associated Items : New Also A-FRM-IHOL, A-OL-O-SUP7788, A-OL-P-SUP7777, A-OL-S-3VOLUME, A-SMO201, A-FRM-IHOL, A-OL-O-SUP7788, A-OL-P-88S88, A-OL-S-3VOLUME, A-SMO201, A-FRM-IHOL, A-OL-O-77, A-OL-P-SUP7777, A-OL-P-77, A-OL-S-HYDR-LEC, A-OL-S-3VOLUME, A-OL-S-667788, A-SMO201, A-FRM-IHOL, A-OL-O-770 And : Dim A (1): 4.159" Long Spline Count: 19 Spline