This is a A-560-6506 Friction Clutch, BP5 Series, 1 3/8" X 6 Spline W/ Double Clamp, 7,965 in/lb. PN: 560-6506Main Description As Following : A-560-6506 Friction Clutch, BP5 Series, 1 3/8" X 6 Spline W/ Double Clamp, 7,965 in/lb. PN: 560-6506 Found in Section & Models : Driveline > Clutch, Bondioli & Pavesi TORQMASTER: 5 SERIES Associated Items : New Also This is An Aftermarket Product And : Weasler alternative to original part. Bore: 1 3/8" - 6 Spline