This is a A-OL40 40 Offset Link (Drives) PN: OL40Main Description As Following : A-OL40 40 Offset Link (USA) P.N: OL40 A-OL40 40 Offset Link (USA) P.N: OL40 Replaces: RCOSL40 EDCOR , SW40OLUS JOHN DEERE , Crossed From: AHLD40 , , AHL40 , , 2221-42321 JOHN DAY , 803-410400 , Found in Section & Models : Chains/ Sprockets/ Pulleys/ Hubs > Roller Chains and Attachment Links, (Miscellaneous) (UNDEFINED): SEVERAL Associated Items : New Also This is An Aftermarket Product And : High Quality Afternaket Shipped from Both US and Canada