This is a A-R227258 O-Ring, HNBR, ORFS PN: R227258Main Description As Following : A-R227258 O-Ring, HNBR, ORFS P.N: R227258 Dim A (1): .61" I.D.Dim B (2): .07" WidthDim C (3): Std. # Code 10Dim D (4): H4C Material Stocked As: A-016G Found in Section & Models : Air Conditioning Parts > O-rings/ Fittings/ Misc, John Deere TRACTOR: 7720, John Deere TRACTOR: 7820, John Deere TRACTOR: 7920 Associated Items : New Also This is An Aftermarket Product And : Dim A (1): .61" I.D. Dim B (2): .07" Width Dim C (3): Std. # Code 10 Dim D (4): H4C Material