This is a A-600-1300 Clutch PN: 600-1300Main Description As Following : A-600-1300 Clutch P.N: 600-1300 Pulley Diameter: 5.75"Pulley Grooves: 1X: 1.132" Stocked As: A-RE10975 Found in Section & Models : Tractor Parts Associated Items : New Also This is An Aftermarket Product And : Pulley Diameter: 5.75" Pulley Grooves: 1 X: 1.132"