Suspension ball joints on there own are not available from Nissan and only a few of them are available aftermarket.
Be careful with the ball joint seating cones as there are 4 different sizes.
Yes, still for sale.
I have facelift (Bi Xenon) and prefacelift (Xenon) complete with ballasts etc in stock.
Just drop me a Personal Message (PM) if I can help further.
There is also a difference in the profile of the bumpers, and that is why you have different front wheel arch liners for the DE and HR,
However, with a bit of plastic surgery, you can get them to fit.