If anyone is interested in the add-on cage extension for the early Suntour Cyclone front derailleur, there's some available on eBay item 310184263773
This item brings back the memories. It was a key part for a 70s cycle touring setup using Suntour derailleurs with wide range half step plus granny chainrings.
Peter Brueggeman
La Jolla California USA
4peebee(at)peterbrueggeman.com