Borgeson Steel Single Needle Bearing Universal Joint (part number 014912)
fits a 3/4″ DD (double D) shaft on one end and a 9/16″-36 spline shaft on the other. It is a single universal joint for custom steering applications.
Key specifications
According to the Borgeson Universal website and other product pages, here are the specifications for the Borgeson Steel Universal Joint with 3/4″ DD and 9/16″-36 connections: