Those pieces are a real pita. They are fixed by odd sized small screws (Whitworth?) which I replaced with standard, tapped on one end, through bolted on the other. On one of my calipers the ears were broken off these parts, and I had to weld new material on, then file to dimension. I might have a single piece or two - will look. Are you looking for a whole set? They are also used on the 4.2 Mk10/420G rear brakes (fronts are different), so you might want to expand your search to those parts cars - probably have to just buy a set of calipers. The New Zealand/Aussie guys might have them.