This is a A-RBX1-14 X Hub PN: RBX1-14Main Description As Following : A-RBX1-14 X Hub P.N: RBX1-14 Dim A (1): 2"Dim B (2): 2-1/2"Dim C (3): 7/16"Dim D (4): 1"Bore: 1-1/4" roundKeyway: 1/4" X 1/8" Replaces: PM20030020 SPROCKET/HUB/PULLEY/IDLER , 20030020 EDCOR , Crossed From: WSH30020 , , W20030020DS CASE-IH , 2827-24527 JOHN DAY , 3016-0132 , , 6713-58913 JOHN DAY , 673-S80031500 , , 673S80031500 , Found in Section & Models : Chains/ Sprockets/ Pulleys/ Hubs > Hubs, (Miscellaneous) (UNDEFINED): SEVERAL Associated Items : New Also This is An Aftermarket Product And : Dim A (1): 2" Dim B (2): 2-1/2" Dim C (3): 7/16" Dim D (4): 1" Bore: 1-1/4" round Keyway: 1/4" X 1/8"