Yes, the barn door off the EV's mounts on the Jackal, as does the larger more streamlined shield they sold as an accessory. They called that the California Sport Touring Shield. Made by National Cycle with specific mounts for the Cali series. Difficult to come by, but if you did, I would take that over the barn door. In any case, they both mount using the holes in the outside of the triple trees.
I don't know about the Cal III stuff.