The manual doesn't seem to cover them, theres an exploded diagram but all the studs are in place.
There are 3 common types.
Most common is a stud with a splined part. Hammer the old one out, then fit a new one from the rear. Then if you have steel wheels its easy, fit a wheel nut on the stud backwards and then tighten till the stud is fully home (use a mirror to look at the back.
Threaded both ends and thread locked in place. You might need to get these this type removed professionally unless you can get it out with mole grips or stillsons etc - screw out and then double nuts locked up against each other to drive it home, a new stud should come with thread lock pre applied.
Occasionally I've come across ones that are simply a bolt screwed through from the back with or without threadlock and sometimes with a locking nut on the front.
Give Nissan/Ford a call and get a replacement, from theat you should be able to tell what type it is, either splined, threaded both ends or with a hex head. Don't imagine they'll be expensive but they will be a dealer only part.