This is a A-50X17 Sprocket PN: 50X17Main Description As Following : A-50X17 Sprocket P.N: 50X17 Hub Required: XInside Diameter: 2"Outside Diameter: 3.719"Teeth: 17 Replaces: PM20005017 SPROCKET/HUB/PULLEY/IDLER , 20005017 EDCOR , Crossed From: WSS105017 , , W20005017DS CASE-IH , 20005017 , , 20005017 , , 2827-39727 JOHN DAY , 3016-0188 , , 6713-51713 JOHN DAY , 673-S80501700 , , 673S80501700 , Found in Section & Models : Chains/ Sprockets/ Pulleys/ Hubs > Sprockets, (Miscellaneous) (UNDEFINED): SEVERAL Associated Items : New Also This is An Aftermarket Product And : Hub Required: X Inside Diameter: 2" Outside Diameter: 3.719" Teeth: 17