What size is the nut on the front wheel bearing on
a 03 grand am gt
You mean the spindle nut? I don't know? Maybe you can go to auto store and see if they have a spindle nut for your vehicle, in stock. Then find socket that will fit spindle nut. Generally your not supposed to reuse old spindle nut. In the past when replacing halfshaft, different vehicle, the old spindle nut didn't use the same socket as the new spindle nut, a real pain.