11inch X 9 inchX1-5/8 inch-25 Spline Standard Duty Double Clutch With PTO Disc. Use Main disc size11 inch x 1-1/8 inch-10 Spline. For Tractor models: Late 135, Late 150, 230, 235, & 245

11 inch X 9 inch X 1-5/8 inch-25 Medium Duty Double Clutch With a Spline PTO Disc. Use Main disc size11 inch x 1-1/8 inch-10 Spline. For tractor models: MF165 Late, MF235, MF235 Orchard, MF245, MF245 Orchard, & MF255 Early

11 inch X 9 inch X 1-5/8 inch-25 Spline Heavy Duty Double Clutch With PTO Disc. Use Main disc size11 inch x 1-1/8 inch-10. For tractor models: MF175 Late, MF255 Late, MF265