There really is no point in going new. The shaft itself will not wear out and the joint and the boot will be new. I don’t think I would get this on line though since you want an exact match and make it easy on yourself to exchange. I would go to a reputable parts store though. To me it would be NAPA and on the OR or AZ. Others may disagree but some of the cheap remans just use the old joint, grease it, put a new boot on and in the box.
It’s not exactly easy though and you need tools. Follow the steps in the book. I once did one on my Riv in the parking garage at work. I think 3-4 hours and my wife found and brought me all the tools I needed.
The clicking sound is from the ball bearings in the CV joint, mounted on the shaft and covered by the boots. No you don’t fix the joint, the joints are replaced but the shaft is just a chunk of machined bar stock.