This is a A-300-5500 Shaft Weld Yoke (w/ Bearing Groove) PN: 300-5500Main Description As Following : A-300-5500 Shaft Weld Yoke (w/ Bearing Groove) PN: 300-5500 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 1-5/16" square bore. Use W/ Shaft Part# 73-1313 Original Weasler part. Bore: 1 5/16" Sq.