[Lynn Eades]

Did they originally have one? A radio kitted carrier would have, I imagine.
The two rods going from the bell housing to the rear hull plate should do it. The battery is grounded to the left hand crosstube roller bracket, through one of its mounting bolts to the hull side plate.
I'd put it from one of the starter mounting bolts, direct back to where the ground stap is fixed, or if you want it to look tidier, to the inside of the bed rail. The most direct route back to the battery, with a good heavy cross section, would be most desireable, particularly on 6 volt.

On the seats. I guess the canvas eventually sucked up the water, so they were painted to try to seal them? whats your thoughts.
the original seat back covers I have, are a shiney coat on thin canvas.

By the way Jordan, while we are hijacking your thread, You doin' great! I hope mine one day, my carrier will be as good as yours.