What steering coupler do I need?

Furyus2, what started it is that the shaft came out of the coupler completely. I got the car Sunday, drove it 200 miles home, and just as I turned into the driveway it pulled out. My friend said replacing it completely would be the best bet and would eliminate potential slop. Like I stated above, I am 100% clueless about how these work and am diving into a cement pool headfirst really. I’m not opposed to spending money on the FR part of its actually a better setup, and I’m not opposed to rebuilding it.