So the ujoint on my 2001 xj sport is shot. Unfortunately the part is a discontinued dealer part. I'd like to try to find a new part and not a rusty junk yard one but I'm not sure what the best option is. Any advice would be greatly appreciated. 52079010AG here is the part number.

 

I had to replace mine with a junkyard one when my 01' got stolen, when the thieves busted it with a screwdriver. Pretty sure a new one or like new one is not only hard to find but quite expensive. I recommend you go with a Junkyard one, but just take your time and find one in decent shape. Mine was honestly in very average shape and has had no issues in 5-6 year since installing.