here she is
Hi Seaeagle,
looking at your pic it looks like the footpeg is bolted at the pedal pivot as Kymbo said. The peg was usually mounted at one of the master cylinder bolts, usually rear but some changed to the front one to get a bit extra legroom and modified the pedal as Kymbo did. If you get a closer pic of that area we could have a better guess. The right hand bracket might even be a home made job, God knows we used to make lots of stuff when the aftermarket stuff was not available or too expensive (Shovel owners and ex Shovel owners tend to watch their pennies and be very inventive.). The way it is set up now puts the peg too close to the ground for my liking. Also, do you have a kicker?, can't see the kicker arm on the pic but it looks like it has the return spring there (can't see clearly on the pic.)As far as I'm concerned Shovels and kickers go together. If you decide to play around with things be aware that 77 was a year in which there were changes with the cam gear/pinion gear/breather gear and also a new tranny case with a new main drive gear and spacer. You usually should not use older parts as the new changes are an improvement and also the old parts will not fit or cause problems if they do. The exception to this is the clutch throw-out bearing.Harley changed to the wafer style bearing in 75, the old bearing is much better and is available aftermarket.
Have fun, The Don
PS: Get yourself a manual, they are invaluable, I prefer the Clymer one.