I just built a CB750H, it's a 77k frame with an F tank, seat, trunk grab bars and taillight assy. I will need to cut the seat hinge bracket off an old wrecked F frame and weld it to the K and probably remove the K hinges. It looks like the seat latch might work.
The reason is I have this bike on my lift, the owner is buried in the cost of other parts and I have all these parts on hand. Too bad the F header won't fit, it auctually will but then no rear brake.