FAFNIR: 203KRR5 BCA: 203RRAR8 IHC: 611928R91 Tye: 522-20SPAC: 562134 DIMENSIONS: BORE: .515" Round O.D. 1.57" Flat IR Width: .72" OR Width: .472" Disc opener for bridger planter. Press wheel for Tye grain drill. Also fits IHC Windrower, AC, JD, Case and other applications.