Recently picked up a left handlebar switch for a '77K CB750 from Vintage CB750 . com, only to discover that the bottom half of the switch doesn't have the cavity for running the wires underneath the handlebars like the OEM's did. The rest of the switch & wiring connections look spot on, though. The old OEM is on the right.

The right side switch they offer is correct, it has the wiring cavity like the original one.