I have a siemens panel, and I got some #4 stranded copper wire to
connect to the ground rods, and water pipes. But when I go to connect
it to the ground/neutral bar, it is too big(just a little too big) to
fit in the slots. Is there another peice that is supposed to be for
this, or do I need to go back and get solid #4 for the ground wire (and
will solid #4 fit).

Thanks!