Wire gauge size Main engine positive?

[Sitka56]

The original round copper clip for the pos(+) battery post split completely and therefore cannot be tightened. 2 large red wires coming to battery (+).. One looks larger than the other. 2004 v10. Does anyone know if the bigger of the two pos (+) wires is 1/0 or 2/0 or???. Before I cut off the old clamp.. want to have the right size lug to crimp on.. Large wire is either soldered or crimped onto the pos copper clamp.Smaller wire already has its own lug.. I am replacing the post clamp with a better type of flat connector.. thanks