trying to find old dia compe canti external springs for my ancient brakes.

The spring on these cantis is external to the body of the canti, the loop of the spring fits over the boss one end sticks out lateral and fastens over the bolt that tightens the brake pad post, the other end fits into a retaining hole on the wheelside of the boss (like regular cantis)

Have checked airbomb, nashbar, harris, aebike

Would like to find a couple of spares. Any dinosaurs know what im talking about? What is this parts name? Source?

Sorry , working on a pic. thanks