This is a A-10001-1056 Implement Yoke, 3/4" Round Bore, 1/4" Keyway, W/ Set Screw PN: 10001-1056Main Description As Following : A-10001-1056 Implement Yoke, 3/4" Round Bore, 1/4" Keyway, W/ Set Screw PN: 10001-1056 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 : Implement Yoke. 3/4" Round bore 1/4" keyway and Set Screw. Centerline is 2-1/2". Weasler alternative to original part. Bore: 3/4" Centerline: 2 1/2" Replaces: Neapco Part No: 10-0423 Single Keyway: 1/4"