not sure that the one in question is original. its a lovely black crinkled finish affair with a nice red label that reads, in part: "American Bosch Inc. 6 volt positive only", or something along those lines.
anyway i'm more concerned that if i'm right about the tweaking, that i may have damaged my one day old Optima battery. wouldn't THAT be shame, ...eh?
so tomorrow i'll probably just be buying one of those 6v regulators made by Standard. probably at O'Reilly's. unless someone convinces me in the mean time that the 10v-11v's i'm reading on my multimeter connected at both ends to the terminals with the car running is normal.