Are you talking about the stock 75-76 pegs, that sit behind instead of in front of the mounts (like the 350F, CB500 and CB550)? I cleaned out my local yard, and they are getting harder to find, but they're on Ebay pretty frequently. I've seen them go for as little as $50 without the brake lever (you'll need that) in not-so-great-but-useable shape. And you might find someone here or at the SOHC four forums ditching theirs for other rear sets. You don't want 1977 CB400F pegs, they sit in front of the mounts. I just looked, and right now there's nothing but ridiculous stuff ($40 or more for one side, and mount only without peg or linkage). But if you're a little patient they'll come up.