Not sure of any current production of these, but the Cyclone calipers were closely copied from the Campagnolo Record caliper, and parts from Record and other clone calipers (SunTour Superbe, Gran Compe Royal, etc.) ought to work, e.g.:


https://www.ebay.com/itm/VTG-Cable-S...-/253945346190

Yellow Jersey may also have something:

http://www.yellowjersey.org/dcbitz.html