This is a A-274363M91 Clutch - York Compressor (1 groove, 6.7" pulley) PN: 274363M91Main Description As Following : A-274363M91 Clutch - York Compressor (1 groove, 6.7" pulley) P.N: 274363M91 Pulley Diameter: 6.70"Pulley Grooves: 1X: 2.82" Stocked As: A-600-206 Found in Section & Models : Air Conditioning Parts > Clutch, Massey Ferguson COMBINE: 410, Massey Ferguson COMBINE: 510 Associated Items : New Also This is An Aftermarket Product And : Pulley Diameter: 6.70" Pulley Grooves: 1 X: 2.82"