This is a A-1081455M91 Clutch - Sanden Style (2 groove 5.22" pulley) (X dim = .507", Y dim = 1.086") PN: 1081455M91Main Description As Following : A-1081455M91 Clutch - Sanden Style (2 groove 5.22" pulley) (X dim = .507", Y dim = 1.086") P.N: 1081455M91 Pulley Diameter: 5.22"Pulley Grooves: 2X: .507"Y: 1.086" Stocked As: A-600-729 Found in Section & Models : Air Conditioning Parts > Clutch, Massey Ferguson TRACTOR: 393 (S/N