This is a A-811-1014 Hexagon Slip Sleeve Yoke PN: 811-1014Main Description As Following : A-811-1014 Hexagon Slip Sleeve Yoke PN: 811-1014 Found in Section & Models : Driveline > Driveline Components, Neapco DOMESTIC: 1000 SERIES, Driveline > Yokes, Neapco DOMESTIC: 1000 SERIES Associated Items : New Also This is An Aftermarket Product And : Hexagonal slip sleeve yoke. 7/8" bore with 5-1/2" centerline. Weasler alternative to original part. Bore: 7/8" Centerline: 5 1/2"