This is a A-818-5520 Overrunning Clamp Yoke PN: 818-5520Main Description As Following : A-818-5520 Overrunning Clamp Yoke PN: 818-5520 Found in Section & Models : Driveline > Clutch, Weasler TORQMASTER: 55 SERIES Associated Items : New Also This is An Aftermarket Product And : Original Weasler part. Bore: 1 3/4" x 20 Spl.