This is a A-104-5520 Ball Shear Clutch, 55 Series, 1 3/4" X 20 Spline, 27,800 in/lb Setting, w/ Safety Slide Lock PN: 104-5520Main Description As Following : A-104-5520 Ball Shear Clutch, 55 Series, 1 3/4" X 20 Spline, 27,800 in/lb Setting, w/ Safety Slide Lock PN: 104-5520 Found in Section & Models : Driveline > Clutch, Weasler Domestic: 55 Series Associated Items : A-13004020 Also This is An Aftermarket Product And : Original Weasler part. Bore: 1 3/4" - 20 Spl. Shear Bolt: (2) 3/8" x 16 Gr. 6