Sorry Chris, looks like the only guys that answer with any conviction on mechanical questions are us old farts trying to keep their 1st gens (real Xterras) alive. Tell Pep to sell that egg crate and buy a used ?00 or ?01 or better yet a Jeep like she really wants to.
On the 1st gens Nissan does not list that you can get parts for the drive shaft (or LCAs) but that you must buy the whole unit. Meanwhile the parts from Frontiers made in the same years are all interchangeable and you are able to get the parts (U-Joints, ball joints for the LCAs, etc.). Sooo, when we 1st gen?ers are looking for parts from NAPA (etc.) we sometimes look for Frontier parts. I'm not sure if the same holds true for 2nd gens but it might be worth checking on ether XOC, NOR or the new X boards (I almost never go on those). Hope that helps, sorry I don't know more. Stupid 2nd gens.