Jason -
I have one that may be what you need - but not sure.
It's definitely not the larger 7-incher.
It says "Stanley 001-012" and "SAE M71", has a three-pronged connector, not three wire leads.
Both filaments work.... I think it was off a '79 CB400T, maybe? I really can't tell if it's the smaller one or maybe an intermediate size.
I also have one that I know is right, off an old 450, but it doesn't work.