This is a A-301-5500 Shaft Weld Yoke (w/ Bearing Groove) PN: 301-5500Main Description As Following : A-301-5500 Shaft Weld Yoke (w/ Bearing Groove) PN: 301-5500 Found in Section & Models : Driveline > Driveline Components, Weasler Domestic: 55 Series, Driveline > Yokes, Weasler Domestic: 55 Series Associated Items : New Also This is An Aftermarket Product And : 55 series shaft weld yoke with bearing groove. Yoke has 1-3/16" square bore. Original Weasler part. Bore: 1 3/16" Sq.