This is a A-101-8321 Spring-Lok Tractor Yoke PN: 101-8321Main Description As Following : A-101-8321 Spring-Lok Tractor Yoke PN: 101-8321 Found in Section & Models : Driveline > Driveline Components, Walterscheid W Series: I, Driveline > Yokes, Walterscheid W Series: I Associated Items : New Also This is An Aftermarket Product And : Weasler alternative to original part. Size: 1 3/8" - 21 spline