Where can one purchase the 12 volt bus bars used in the Barths? I need the ones which have the slotted positions for mounting the circuit breakers. I have been unable to locate any anywhere.

When I need a copper bus bar, and don't feel like going to the metal yard, I slit and flatten a piece of copper tube or pipe and notch or drill to fit.

See: http://store.electrical-insula...aded-copper-bar.html