For a steering U-joint with a 3/4″ Double-D (DD) bore on one end and a 1″ DD bore on the other, you can find products from well-known steering component manufacturers like Borgeson and Flaming River, as well as several other brands. These are typically used in custom hot rod, street rod, and race car steering applications. 

Borgeson is a highly respected manufacturer of steering components, known for its precision engineering and high-quality construction. Its single needle bearing universal joints offer smooth operation and a maximum operating angle of up to 35 degrees.