I don't know about these other answers, but the truth is most wheel studs are splined and pressed into the hub. You can hammer them out with a very large hammer or hand sledge but should use the proper tool to press them back into the hub. Almost every vehicle is like this, including transport trucks. The tool may be available with the instructions from a auto parts supplier. Or you can take it to a shop, the cost may be less than an hours labour depending how many are damaged.
Depends on the tractor. If it has a differential nically.2 If you take apart the rear assembly, there is an axle from the differential to each wheel. If you don't have a differential then the axle is solid from one side to the other so there's only one.
First remove the wheel, or in your case just jack the car up. The the stud that needs to be replaced using a pair of vise grips just lock them on and turn it counter clock wise. Then install the new wheel stud and remount your wheel. DONE!
Len is on the money but in most cases you can seat the new studs by tightening the lug nut down as far as the threads will easily go, then putting the wheel on and finishing the job. You may need to rotate the wheel to line up the studs with a cutout in the backing plate to get them out and in. Some cars, like older Volvos, require the tool (basically a hand press) because the splines are oversize on the replacements.
The answer is right in you question. Single equals one.
