These are called "Highway Foot Rest" or "Highway Pegs" and until recently were available from "Motorcycle Larry" in the USA. The fit to the tip over bars under the black covers on the side of the bike. Sadly this business appears to be no longer trading and second hand ones are as rare as hens teeth. Keep an eye on the Forum because I'm sending my set up to "gone-cruising" in Queensland who hopes to work with a fabricator to have some sets made for sale to members.