So, there was a limiter to keep the lamps from burning out, but the battery voltage was unregulated? Seems like a problem to me, as excess charge voltage to the battery would boil the water out and cook a battery.
I don't know of a to source buy one, but a linear pass regulator is what I'd build. I have one on my CB450 (12V) now, replacing the one I described. I bought it from someone in Oregon; there's a bigger market for 12V systems, though. If you have a friend who is an electronics experimenter, regulators are fairly easy to design and build, it's the packaging which is the most trouble.
Basically, you would have:
AC from stator --> rectifier --> regulator --> battery --> key switch --> feedback to regulator, lights, everything else.
With this arrangement, the battery voltage is controlled at about 7.4V, protecting your battery, and your lights won't burn too brightly.
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'68-7? CB450 and '98 Valkyrie Tourer, too