Sparex source: https://us.sparex.com/pto-adapter-female-spline-1-3-4-20-x-male-spline-1-3-8-21-with-clamp-bolt-13372.html Product: PTO Adapter - Female Spline 1 3/4'' - 20 X Male Spline 1 3/8'' - 21 With Clamp Bolt. - Sparex S.13372 SKU: S.13372 Listing note: Length: 200mm (7-7/8'')Increases length: 140mm (5-1/2'') Detail enrichment pending: OEM cross references, fitment, catalog pages, and full specifications.