This is a A-PLW3-12 Pulley PN: PLW3-12Main Description As Following : A-PLW3-12 Pulley P.N: PLW3-12 This pulley can be used with either A or B width belts due to its dual groove / taper configuration.Hub Required: WOutside Diameter: 3.5" Crossed From: WSP350W , , 21020035 , , 21020035 , , 2827-43927 JOHN DAY , 673-S85010300 , , 673S85010300 , Found in Section & Models : Chains/ Sprockets/ Pulleys/ Hubs > Pulleys, (Miscellaneous) (UNDEFINED): SEVERAL Associated Items : New Also This is An Aftermarket Product And : This pulley can be used with either A or B width belts due to its dual groove / taper configuration. Hub Required: W Outside Diameter: 3.5"