You have an XE. You may have to do all four corners since the NX200 comes as 4-wheel disc brakes. This would entail getting all pieces of the brake system: calipers, rotors, lines, and Brake Master Cylinder.
However, if you like, I believe you can do just the front brakes where the size is different versus the SE-Rs. All you will then need is the rotors and calipers. I would suggest getting them from your local autoparts store where they have been reman since they are cleaner and the seals are new.
If you really want the best answers for your technical questions, especially for parts that are commonly found on SR20DE cars, go to
www.SR20Forum.com.