Okay, my 77 CB550F bar ends while sitting on bike are 38.5 inches to floor each side.
Bar end to end width across bike is 31 inches The handle bar rise is 3 inches! So, I got that wrong for a 77 model.
The K models are 4 or 5 inches rise as is my 75 CB550F model. So, if you wish for stock, the 75 should have taller bars.
I can measure the 76 F I have if you like. But, it has set backs for the Vetter fairing. Makes them a bit lower at bar ends. Mine also has that 3 inch rise, though. Wires are though bars, but I don't know if that one is stock. Got it from a wrecking yard.
Cheers,