Curved outer race, 1-3/4" rd. bore, 3.937" O.D. For Brent early CPC rippers with 2 piece 4-bolt flange; Miller Series I, II, Heavy Duty and New Holland OD100, OD200 discs with 24" or 26" blades; Sunflower G2, G3, G4, 1320, 1330, 1430, 1440, 1540; Ford 250 discs.