This joint adapts a 17MM DD to a 3/4 DD. We use this adaptor to adapt a 3/4 DD intermediate shaft to a 17MM male steering rack shaft. This is the same as what we use in our 5th Gen Camaro Steering Column. This joint needs to be welded or cross-drilled depending on your preference for fastening.
The steering column is amazing. U-joints worked perfect. You need this one and a DD shaft if you are using the factory steering rack. Customer service is great. Highly recommend!!!