Starter post/stud

[hb32]

As per my previous threads, keeping my pickup 6 volt positive ground. I just finished making the cables for the battery to solenoid and solenoid to starter. Tightening down the starter end and it is stripped. Ran a die and looks like threads have taken a beating over the years. What is the process to replace the stud and where can I source one ? I am hoping to find something local through a parts store if possible.
Thanks