You might want to send Wayne Bingham at Mel Pinto Imports an email. Mel Pinto was an importer of CLB back in that time period. Wayne has all sorts of small service parts, and you might get lucky. As an aside, some models of Galli brakes from that time period used CLB pads and holders. That is another needle in a haystack, but on the bright side searching for them as well increases your chances by 100%.