This is a A-805-W39301 Slip Clutch Disc (Modern) PN: 805-W39301Main Description As Following : A-805-W39301 Slip Clutch Disc (Modern) P.N: 805-W39301 Inside Diameter: 4-1/2" (114.3 mm)Outside Diameter: 6-1/2" (165 mm)Thickness: .124" Stocked As: A-W39301 Found in Section & Models : Tractor Parts Associated Items : New Also This is An Aftermarket Product And : Inside Diameter: 4-1/2" (114.3 mm) Outside Diameter: 6-1/2" (165 mm) Thickness: .124"