This is a A-1K126 Seal, Front Crankshaft PN: 1K126Main Description As Following : A-1K126 Seal, Front Crankshaft P.N: 1K126 Dim A (1): 2.75" ODDim B (2): 2.05" IDDim C (3): .44" Thick Crossed From: 391142 , Found in Section & Models : Engine Parts > 129 CID, 4 Cyl Gas, White/ Oliver/ Mpl Moline TRACTOR: 66 (GAS S/N <6503), Engine Parts > 144 CID, 4 Cyl Diesel, White/ Oliver/ Mpl Moline TRACTOR: SUPER 55 (DIESEL S/N <72831), White/ Oliver/ Mpl Moline TRACTOR: SUPER 66 (DIESEL S/N <72831), White/ Oliver/ Mpl Moline TRACTOR: 550 (DIESEL S/N <72831), Engine Parts > 144 CID, 4 Cyl Gas, White/ Oliver/ Mpl Moline TRACTOR: SUPER 55 (GAS S/N <72831), White/ Oliver/ Mpl Moline TRACTOR: SUPER 66 (GAS S/N <72831), White/ Oliver/ Mpl Moline TRACTOR: 550 (GAS S/N <72831), Engine Parts > 194 CID Diesel, White/ Oliver/ Mpl Moline TRACTOR: 77 (DIESEL), Engine Parts > 194 CID, 6 Cyl Gas, White/ Oliver/ Mpl Moline TRACTOR: 77 (GAS), Engine Parts > 216 CID, 6 Cyl Diesel, White/ Oliver/ Mpl Moline TRACTOR: SUPER 77 (SN 6503>, DIESEL), White/ Oliver/ Mpl Moline TRACTOR: 770 (SN 6503>, DIESEL), Engine Parts > 216 CID, 6 Cyl Gas, White/ Oliver/ Mpl Moline TRACTOR: SUPER 77 (GAS), White/ Oliver/ Mpl Moline TRACTOR: 770 (GAS), Engine Parts > 231 CID Diesel, White/ Oliver/ Mpl Moline TRACTOR: 88 (DIESEL), Engine Parts > 231 CID Gas, White/ Oliver/ Mpl Moline TRACTOR: 88 (GAS), Engine Parts > 231, 248, & 265 CID, 6 Cyl Gas, White/ Oliver/ Mpl Moline TRACTOR: 1600 (GAS), White/ Oliver/ Mpl Moline TRACTOR: 1650 (GAS), White/ Oliver/ Mpl Moline TRACTOR: 1655 (GAS), Engine Parts > 232 CID, 6 Cyl Diesel, White/ Oliver/ Mpl Moline TRACTOR: 1550 (DIESEL), White/ Oliver/ Mpl Moline TRACTOR: 1555 (DIESEL) Associated Items : New Also A-FRM-IHOL, A-OL-O-SUP55, A-OL-P-SUPER55, A-OL-S-3VOLUME, A-SMO201, A-FRM-IHOL, A-OL-O-66SUPER, A-OL-P-66, A-OL-S-3VOLUME, A-SMO201, 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 And : Dim A (1): 2.75" OD Dim B (2): 2.05" ID Dim C (3): .44" Thick