This is a A-71385837 Belt, Chopper Primary Drive PN: 71385837Main Description As Following : A-71385837 Belt; Chopper Primary Drive, 123.8" P.N: 71385837 7/8 X 136.75 Wrapped Kevlar CordColor: BlackLength: 136.75Material: Kevlar CordThickness: 0.556Type: WrappedWidth: 7/8 Crossed From: AM71385837 , Found in Section & Models : Belts > Combine Belts, Challenger COMBINE: 660 (SN