This is a A-748831 Spring PN: 748831Main Description As Following : A-748831 Spring P.N: 748831 New double heat treated 2 prong forged guard. Two stage heat treatment increases hardness and durability. Replaces Buchanan No. BU215H. Fits Hesston auger headers, mower conditioners and windrowers. Stocked As: A-80A80 Found in Section & Models : Hay Tool Parts > Slip Clutch Parts, Terrain King ROTARY CUTTER: SEVERAL Associated Items : New Also This is An Aftermarket Product And : Inside Diameter: 2.88" Outside Diameter: 4.725"