This is a A-307985A1 Concave, Middle/Rear Extension (Small Grain) PN: 307985A1Main Description As Following : A-307985A1 Concave, Middle/Rear Extension (Small Grain) P.N: 307985A1 Quantity: 2 UsedType: Small Grain Replaces: 1318554C1 IH COMBINE , Crossed From: AV101809 VAPORMATIC Found in Section & Models : Threshing Area > Concaves, Case-IH COMBINE: 1640, Case-IH COMBINE: 1644, Case-IH COMBINE: 1660, Case-IH COMBINE: 1666, Case-IH COMBINE: 1670, Case-IH COMBINE: 2144, Case-IH COMBINE: 2166, Case-IH COMBINE: 2344, Case-IH COMBINE: 2366 Associated Items : New Also A-IH-S-1660COMB, A-IH-S-1660COMB, A-IH-S-1660COMB And : Quantity: 2 Used Type: Small Grain