This is a A-307989A1 Concave, Middle/Rear Extension (Small Grain) PN: 307989A1Main Description As Following : A-307989A1 Concave, Middle/Rear Extension (Small Grain) P.N: 307989A1 Quantity: 2 UsedReplaces: 1318558C1Type: Small Grain Replaces: CIHCE1680MR *** NO CLASS *** , 1318558C1 IH COMBINE , Crossed From: AV100371 VAPORMATIC Found in Section & Models : Threshing Area > Concaves, Case-IH COMBINE: 1680 (Used With Concave A-1309207C3), Case-IH COMBINE: 1682 (Used With Concave A-1309207C3), Case-IH COMBINE: 1688 (Used With Concave A-1309207C3), Case-IH COMBINE: 2188 (Used With Concave A-1309207C3), Case-IH COMBINE: 2388 (Used With Concave A-1309207C3) Associated Items : New Also A-IH-S-1660COMB, A-IH-S-1660COMB And : Quantity: 2 Used Replaces: 1318558C1 Type: Small Grain