Sparex source: https://us.sparex.com/pto-adapter-female-spline-1-3-8-6-x-male-spline-1-3-8-21-with-quick-release-collor-13377.html Product: PTO Adapter - Female Spline 1 3/8'' - 6 X Male Spline 1 3/8'' - 21 With Quick Release Collor. - Sparex S.13377 SKU: S.13377 Listing note: Length: 165mm (6-1/2'')Increases length: 89mm (3-1/2'') Detail enrichment pending: OEM cross references, fitment, catalog pages, and full specifications.