The early cb400f pegs bolt right on the cb550 frame. The shifter side is perfect fit but the right side needs a bit of grinding to make space for the kick starter.
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Not quite.... see the link above. You need to heat and bend the brake lever and find a 550F kicker. I like flipping the heim joint on the shifter side, too. And I've had to slightly enlarge the hole for the locating pin as well.
I've never used them on a 550F model. You may run into issues with the way the F model brake pivot mounts, among other things.
The Tarozzi stuff is nice and well made.