Seems
Flanders makes Dogleg levers that fit a CB750: in silver, #402-19101 for the left (clutch), #402-10102 for the right (brake). In black, they only have #402-19201 for the left (clutch), and nothing's available in chrome, carbon, or the colour combinations. They also stock direct OEM replacements if that's your fancy.
I'm going to pick up a set of the doglegs in silver. Even though my hands are normal sized, I find the extra reach distance slows down my reaction time enough to concern me. I'll post photos here once they work their way to Canada and I put 'em on the bike.